Explications étape par étape:
A
5(x+ 3) = 2x - 5
5x + 15 = 2x - 5
5x - 2x = - 5 - 15
3x = - 20
x = 20/3
B.
4 ( 2x - 5 ) - 1 = 4x + 1
8x - 20 - 1 = 4x + 1
8x - 4x = 1 + 20 + 1
4x = 22
x = 22 /4 = 11 / 2
C.
( 4x + 7 ) - ( - 2x + 6 ) = 8
4x + 7 + 2x - 6 = 8
4x + 2x = 8 - 7 + 6
6x = 7
x = 7 / 6
D.
3 ( 2x - 5 ) + 2 = x - 2
6x - 15 + 2 = x - 2
6x - x = - 2 + 15 - 2
5x = 11
x = 11 / 5
