a) 3.x + 30 = (-3)2
3.x + 30 = 9
3.x = 9 - 30
3.x = -21
x = -21 : 3
x = -7
b) 171 - 5(x + 7) = 236
5(x + 7) = 171 - 236
5(x + 7) = -65
x + 7 = -65 : 5
x + 7 = -13
x = -13 - 7
x = -20
c) -14 - (1 - 4x) = -7
1 - 4x = -14 - (-7)
1 - 4x = -7
4x = 1 + 7
4x = 8
x = 2
mik nhah nhất đó
k mik nha
a) 3 . x + 30 = (-3)2
3 . x + 30 = 9
3 . x = 9 - 30
3 . x = 21
x = 21 : 3
x = 7
b) 171 - 5(x + 7) = 236
5(x + 7) = 236 - 171
5(x + 7) = 65
x + 7 = 65 : 5
x + 7 = 13
x = 13 - 7
x = 5
c) -14 - (1 - 4x) = -7
1 - 4x = -14 - (-7)
1 - 4x = -7
4x = 1 - (-7)
4x = 8
x = 8 : 4
x = 2
a)3x+30=(-3)^2
3x+30=9
3x =9-30
3x = -21
x = -21/3
x = -7
b)171-5(x+7)=236
5(x+7)=171-236
5(x+7)= -65
x+7 = -65/5
x+7 = -13
x = -13-7
x = 6
c)-14-(1-4x)= -7
1-4x = -14-(-7)
1-4x = -7
4x = 1-(-7)
4x =8
x =8:4
x =2
(sai cx k bn nha ^^)
a)3x+30=(-3)^2
3x+30=9
3x =9-30
3x = -21
x = -21/3
x = -7
b)171-5(x+7)=236
5(x+7)=171-236
5(x+7)= -65
x+7 = -65/5
x+7 = -13
x = -13-7
x = 6
c)-14-(1-4x)= -7
1-4x = -14-(-7)
1-4x = -7
4x = 1-(-7)
4x =8
x =8:4
x =2