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\(\left(20x-x\right)-\left(-14-2x\right)+\left(-35-x\right)=5-3x\)
\(20-x+14+2x-35-x=5-3x\)
\(-1=5-3x\)
\(3x=5+1\)
\(3x=6\)
\(x=6:3\)
\(x=2\)
( 20 - x ) - ( -14 - 2x ) + ( -35 - x ) = 5 - 3x
20 - x + 14 + 2x - 35 - x =5-3x
20 - x + 14 + 2x - 35 - x + 3x =5
( -x + 2x - x + 3x ) + ( 20 + 14 - 35 ) = 5
3x - 1 = 5
3x = 5 + 1
3x = 6
x = 6 : 3
x = 2
Vậy x = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
a,\(\left(\frac{7}{5}-2x\right).\frac{40}{20}=\frac{8}{14}\)
\(\Rightarrow\left(\frac{7}{5}-2x\right).2=\frac{4}{7}\)
\(\Rightarrow\frac{7}{5}-2x=\frac{4}{7}:2\)
\(\Rightarrow\frac{7}{5}-2x=\frac{2}{7}\)
\(\Rightarrow2x=\frac{7}{5}-\frac{2}{7}\)
\(\Rightarrow2x=\frac{39}{35}\)
\(\Rightarrow x=\frac{39}{35}:2\)
\(\Rightarrow x=\frac{39}{70}\)
b, \(\frac{7}{2}.x-20\%.x=-4\)
\(\Rightarrow x\left(\frac{7}{2}-20\%\right)=-4\)
\(\Rightarrow x\left(\frac{7}{2}-\frac{1}{5}\right)=-4\)
\(\Rightarrow x\frac{7}{10}=-4\)
\(\Rightarrow x=-4:\frac{7}{10}\)
\(\Rightarrow x=-\frac{40}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2x-20:5=14\)
\(\Rightarrow2x-4=14\)
\(\Rightarrow2x=14+4\)
\(\Rightarrow2x=18\)
\(\Rightarrow x=18:2\)
\(\Rightarrow x=9\)
Vậy x = 9
Chúc em học tốt nha!^^
![](https://rs.olm.vn/images/avt/0.png?1311)
2x - (-20) = 14
2x = 14 + (-20)
2x = -6
x =-6:2
x = -3
![](https://rs.olm.vn/images/avt/0.png?1311)
2x+20=-22
=> 2x = -22 - 20
=> 2x = -42
=> x = -42 : 2
=> x = -21
Vậy x = -21
2x+20=-22
2x=-22-20
2x=-42
x=-42:2
x=-21
-(-30)-(-x)=13
30+x=13
x=13-30
x=-17
-(-x)+14=12
x+14=12
x=12-14
x=-2
x+20=-(-23)
x+20=23
x=23-20
x=3
15-x+17=-(-6)+|-12|
15+17+x=6+12
32+x=18
x=18-32
x=-14
-|-5|-(-x)+4=3-(-25)
-5+x+4=3+25
-5+4+x=28
-1x=28
x=28:(-1)
x=-28
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 12 =(-5)-x
x + x = -5 - 12
2x = -17
\(x=-\frac{17}{2}\)
x + 5 = 10 - x
x + x = 10 - 5
2x = 5
\(x=\frac{5}{2}\)
12-x=x+1
12 - 1 = x+x
11=2x
x=\(\frac{11}{2}\)
14+4x=3x-20
4x-3x=-20-14
x=-34
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(x+15=18-\left(-27\right)\)
\(\Leftrightarrow x+15=18+27\)
\(\Leftrightarrow x+15=45\)
\(\Leftrightarrow x=45-15\)
\(\Leftrightarrow x=30\)
b) \(-x+7=28\)
\(\Leftrightarrow-x=28-7\)
\(\Leftrightarrow-x=21\)
\(\Leftrightarrow x=-21\)
c) \(20-\left(-x\right)=14\)
\(\Leftrightarrow20+x=14\)
\(\Leftrightarrow x=14-20\)
\(\Leftrightarrow x=-6\)
d) \(2x+5=x-14\)
\(\Leftrightarrow2x+5-\left(x-14\right)=0\)
\(\Leftrightarrow2x+5-x+14=0\)
\(\Leftrightarrow x+19=0\)
\(\Leftrightarrow x=0-19\)
\(\Leftrightarrow x=-19\)
e) \(x+17=-8-20\)
\(\Leftrightarrow x+17=-\left(8+20\right)\)
\(\Leftrightarrow x+17=-28\)
\(\Leftrightarrow x=-28-17\)
\(\Leftrightarrow x=-\left(28+17\right)\)
\(\Leftrightarrow x=-45\)
f) \(3x+15=2x+6\)
\(\Leftrightarrow3x+15-\left(2x+6\right)=0\)
\(\Leftrightarrow3x+15-2x-6=0\)
\(\Leftrightarrow x+9=0\)
\(\Leftrightarrow x=0-9\)
\(\Leftrightarrow x=-9\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 45 - 3x = 15
3x = 30
x = 10
b) 4x - 20 = 32
4x = 52
x = 13
c) 2x : 16 = 14
2x = 224
x = 112
d) 0 : 5x = 0
=> x thuộc Z
e) 3240 : 9x = 18
9x = 180
x = 20
a,45-3x=15
-3x=-30
x=10
b,4x-20=32
4x=52
x=13
c,2x:16=14
2x=224
x=112
d,0:5x=0
5x=0
x=0
e,3240:9x=18
9x=180
x=20
=.= hok tốt!!
x=-3
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