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c) (25 - 6x) . 3 - 5 = 7
(25 - 6x) . 3=7+5
(25 - 6x) . 3=12
25 - 6x=12/3
25 - 6x=4
6x=25-4
6x=21
x=21/6
x=3,5
a) (3x - 23) . 14 = 98
(3x - 23)=98/14
3x-23=7
3x=7+23
3x=30
x=30/3
x=10
18x -19 = 21 + 8x
18 x - 8x = 21 + 19
10 x = 40
x =4
g) 18 -4x=-20-6x
-4x + 6x = -20 - 18
2x = -38
x= -19
k, -10 \(x\) - 27 = -7\(x\) + 33
-27 - 33 = -7\(x\) + 10\(x\)
3\(x\) = -60
\(x\) - 20
m, -17\(x\) - 24 = -9\(x\) - 40
-24 + 40 = -9\(x\) + 17\(x\)
8\(x\) = 16
\(x\) = 2
a)\(\frac{x}{5}=\frac{-8}{20}\rightarrow x=\frac{5\cdot\left(-8\right)}{20}=-2\)
Vậy x =-2
b)\(\frac{3}{x-1}=\frac{33}{-77}=\frac{3}{-7}\Rightarrow x-1=-7\Rightarrow x=\left(-7\right)+1=-6\)
Vậy x=-6
c)\(\frac{3}{4}=\frac{x+2}{x+5}\Rightarrow3\cdot\left(x+5\right)=4\cdot\left(x+2\right)\)
\(\Rightarrow3x+15=4x+8\)
\(\Rightarrow3x-4x=8-15\)
\(\Rightarrow\left(-1\right)\cdot x=-7\Rightarrow x=\left(-7\right)\div\left(-1\right)=7\)
Vậy x=7
d)\(\frac{12}{x+3}=\frac{x+3}{3}\Rightarrow\left(x+3\right)\cdot\left(x+3\right)=12\cdot3\)
\(\Rightarrow\left(x+3\right)^2=36\Rightarrow x=\pm6\)
Có 2 TH:
TH1:
x+3=6
x=6-3=3
TH2:
x+3=-6
x=(-6)-3=-9
Vậy x thuộc{3;6
a) 10+2x=45:43
10+2x=42
10+2x=16
2x=16-10
2x=6
x=6:2
x=3
vậy x=3
b)130-(100+x)=25
100+x=130-25
100+x=105
x=105-100
x=5
vậy x=5
c)22.(x+32)-5=55
4.(x+9)=55+5
x+9=60:4
x+9=15
x=15-9
x=6
vậy x=9
d)72-7(13-x)=14
49-7(13-x)=14
7(13-x)=49-14
13-x=35:7
13-x=5
x=13-5
x=8
vậy x=8
a. \(x-\frac{3}{7}:\frac{9}{14}=-\frac{7}{6}\Rightarrow x-\frac{2}{3}=-\frac{7}{6}\Rightarrow x=-\frac{1}{2}\)
b. \(\frac{3}{4}+\frac{1}{4}x=\frac{5}{8}\Rightarrow\frac{1}{4}x=-\frac{1}{8}\Rightarrow x=-\frac{1}{2}\)
c. \(\left|4x-1\right|-\frac{1}{2}=3\Rightarrow\left|4x-1\right|=\frac{7}{2}\Leftrightarrow\orbr{\begin{cases}4x-1=\frac{7}{2}\\4x-1=-\frac{7}{2}\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\frac{9}{8}\\x=-\frac{5}{8}\end{cases}}}\)
d. \(25\%x+x=-1,25\Rightarrow125\%x=-1,25\Rightarrow\frac{5}{4}x=-\frac{5}{4}\Rightarrow x=-1\)
a) -15x + 20 =-25
\(\Leftrightarrow\) -15x = -25 - 20 = -45
\(\Leftrightarrow\)x = 3