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a)
219-7(x+1)=100
=>7(x+1)=219-100
=>7(x+1)=119
=>x+1=119:7
=>x+1=17
=>x=16
A) 7(X+1)=219-100
7(x+1)=119
x+1=17
x=17+1
x=18
b)3x.6=54:3
3x.6=18
3x=18:6
3x=3
x=3:3
x=1
(3x-6)x3=34
3x-6=34:3
3x-6=34/3
3x=34/3+6
3x=52/3
x=52/3:3
x=52/9 tick tui nha Dương Ngọc Quỳnh Anh
1)-(-3)3-(2x+1)3=152
27-(2x+1)3=152
(2x+1)3=-125
(2x+1)3=(-5)3
2x+1=-5
2x=-4
x=-2
2)-(x+6)-34=12+3x
-x-6-34=12+3x
-x-3x=12+6+34
-4x=52
x=-13
a) 5x - 14 = x - 34
5x - x = -34 + 14
4x = -20
x = -20 : 4
x = -5
b) x - 3 - (3x + 2) = -15
x - 3 - 3x - 2 = -15
x - 3x = -15 + 3 + 2
-2x = -10
x = (-10) : (-2)
x = 5
c) 2(x - 12) + 19 = x + (-34)
2x - 24 + 19 = x + (-34)
2x - x = -34 + 24 - 19
x = -29
d) 2(x - 33) - 3(x - 43) = 96 - 115
2x - 66 - 3x + 129 = 96 - 115
2x - 3x = 96 - 115 + 66 - 129
-x = -82
x = 82
e) 2x + 3 - 9x = -11
2x - 9x = -11 - 3
-7x = -14
x = (-14) : (-7)
x = 2
f) -(x + 3 - 84) = (x + 70 - 71) - 6
-x - 3 + 84 = x + 70 - 71 - 6
-x - x = 70 - 71 - 6 - 84
-2x = -91
x = (-91) : (-2)
x = 45,5
1)120 + ( 34 + 3x ) - ( 6 + x ) = 0
=> 120 + 34 + 3x - 6 - x = 0
=> ( 120 + 34 - 6 ) + ( 3x - x ) = 0
=> 148 + 2x = 0
=> - 2x = 148 => x = 148 : ( - 2 )
=> x = -74
Vậy x = - 74
2)\(\dfrac{-5}{6}-x=\dfrac{7}{12}+\left(\dfrac{-1}{3}\right)\)
\(=>x=\dfrac{-5}{6}-\left(\dfrac{7}{12}-\dfrac{1}{3}\right)\)
\(=>x=\dfrac{-5}{6}-\dfrac{7}{12}+\dfrac{1}{3}\)
\(=>x=\dfrac{-10}{12}-\dfrac{7}{12}+\dfrac{4}{12}\)
\(=>x=\dfrac{-10-7+4}{12}=\dfrac{-13}{12}\)
Vậy x = \(\dfrac{-13}{12}\)
tick cho mk nha
\(3x-6=102\\ 3x=96\\ x=32\)