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\(x-\left(27-x\right)=x-17\)
\(\Leftrightarrow x-27+x=x-17\)
\(\Leftrightarrow x+x-x=-17+27\)
\(\Leftrightarrow x=10\)
Vậy ...
a,\(15-\left(-4-x\right)=6\)
\(\Leftrightarrow-4-x=15-6\)
\(\Leftrightarrow-4-x=9\)
\(\Leftrightarrow x=-4-9\)
\(\Leftrightarrow x=-13\)
b,\(-30+\left(25-x\right)=-1\)
\(\Leftrightarrow25-x=-1-\left(-30\right)\)
\(\Leftrightarrow25-x=29\)
\(\Leftrightarrow x=25-29=-4\)
c,\(x-\left(12-25\right)=-8\)
\(\Leftrightarrow x+13=-8\)
\(\Leftrightarrow x=-21\)
e,\(x-5=1\Rightarrow x=6\)
g,\(x+30=-4\)
\(\Leftrightarrow x=-4-30\)
\(\Leftrightarrow x=-34\)
h,\(x-\left(-24\right)=3\)
\(\Leftrightarrow x+24=3\)
\(\Leftrightarrow x=3-24\)
\(\Leftrightarrow x=-21\)
i,\(\left(x+5\right)+\left(x-9\right)=x+2\)
\(\Leftrightarrow x+5+x-9-x-2=0\)
\(\Leftrightarrow x-6=0\)
\(\Leftrightarrow x=6\)
k,\(\left(27-x\right)+\left(15+x\right)=x-24\)
\(\Leftrightarrow27-x+15+x-x+24=0\)
\(\Leftrightarrow-x+66=0\)
\(\Leftrightarrow-x=-66\)
\(\Leftrightarrow x=66\)
a) 15-(-4-x)=6
15 + 4 + x = 6
19 + x = 6
x = 6 - 19
x = 6 + ( -19 )
x = -13
b) -30+( 25- x ) =-1
25- x = -1 - ( - 30 )
25- x = -1 + 30
25- x =29
x = 25 - 29
x = 25 + ( -29 )
x = -4
c) x- ( 12-25) =-8
x - ( - 13 ) = -8
x + 13 = -8
x = -8 - 13
x = -8 + ( -13 )
x = - 21
d) ( x-29 ) - (17- 38 ) = -9
( x-29) - (-21 ) = -9
x -29 = -9 + ( -21 )
x -29 = -30
x = -30 + 29
x = -1
e) x-5=1
x = 1 + 5
x = 6
g) x + 30 = -4
x = -4 - 30
x = -4 + ( -30 )
x = -34
h) x- ( -24 ) = 3
x = 3 + ( -24 )
x = -21
l) 22- ( - x ) = 12
-x = 22 - 12
-x = 10
x = -10
i) ( x + 5 ) + ( x - 9 ) = x + 2
x + 5 + x - 9 = x + 2
x + x + ( 5 - 9 ) = x + 2
x + x + ( -4 ) = x + 2
x + x = x + 2 - ( -4 )
x + x = x + 2 + 4
x + x =x + 6
=> x = 6
a) -12(x - 5) + 7(3 - x) = 5
<=> -12x + 60 + 21 - 7x = 5
<=> -19x = 5 - 81
<=> -19x = -76
<=> x = -76/-19 = 4
b) -45 : 5.(-3 - 2x) = 3
<=> -9(-3 - 2x) = 3
<=> 27 + 18x = 3
<=> 18x = 3 - 27
<=> 18x = -24
<=> x = -24/18 = -4/3
c) -35.24 - 35.76 - x = 154
<=> -35(24 + 76) - x = 154
<=> x = -35.100 - 154
<=> x = -3654
d) \(\left(\frac{5}{x}+\frac{1}{-9}\right)-\left(-15\right)=161\)
<=> \(\frac{5}{x}-\frac{1}{9}=161-15\)
<=> \(\frac{5}{x}-\frac{1}{9}=146\)
<=> \(\frac{5}{x}=146+\frac{1}{9}\)
<=> \(\frac{5}{x}=\frac{1315}{9}\)
<=> \(x=5:\frac{1315}{9}=\frac{9}{263}\)
a) -12.(x-5) + 7 . (3-x) =5
=>-12x+60+21-7x=5
=>-19x+81=5
=> -19x =-76
=> x = 4
b) -45 : 5 . ( -3-2x) =3
=> -9 . ( -3 -2x)=3
=>27+18x=3
=> 18x =-24
=> x= -4/3
c) -35.24-35.76-x =154
=> -35(24+76) -x =154
=>-3500 -x=154
=> x = -3654
d) ( 5 / x + 1/ -9) -(-15) =161
(5/x + 1/-9)+15 =161
=> 5/x + 1/-9 = 146
=> 5/x = 146 - 1/-9
=> 5/x=1315/9
=> x=657/9 ( ko biết có sai ko nx )
\(\left(27-x\right)+\left(15+x\right)=x-24\)
\(27-x+15+x=x-24\)
\(-x+x-x=-24-27-15\)
\(-x=-66\)
\(x=66\)
(27-x) +(15+x)=x-24
<=>\(27-x+15+x=x-24\)
<=>\(\left(-x\right)+x-x=-2-15-27\)
<=>\(-x=-44\)
<=>\(x=44\)
Vậy x=44