(2X+7)=-135
2X=-135-7=-142
X-142/2==-71
2x =-142
x =-142:2
x =-71
Vậy x=-71
(2x+7)+135=0
2x+7 =0-135
2x+7 =-135
2x = -135-7
2x =-142
x =-142:2
x =-71
( 2x + 7 ) + 135 = 0
2x + 7 = 0 - 135
2x + 7 = -135
2x = -135 - 7
2x = -142
x = -142 : 2
x = -71