2(3x+4)-5(1-2x)=7(2x-3)+12

2(3x+4)-5(1-2x)=7(2x-3)+12
6x+8-5+10x= 14x-21+12
16x+3=14x-9
16x-14x=-9-3
2x= -12
x=-12/2
x=-6

Bonjour

6 x + 8 - 5 + 10 x = 14 x - 21 +12

6 x + 10 x - 14 x = - 21 +12 - 8 +5
16 x -14 x = 17 - 29
2 x = - 12
x = - 12/2 
x = -6