Sagot :
1/ -15x +1 = 8x +4-2x
-15x-8x+2x = 4-1
-21x = 3 donc x = 3/21 ou 1/7
2/ 8 -6x+12 = 5x -x-1
-6x-5x+x = -1-8-12
-10x = -21 donc x = -21/-10
3/ 8 +3x-2 = 5x-3x+5
3x-5x+3x =5+2-8
6x-5x =10-8
x = 2
1) 3-5x+1=8x+4-2x
-5x+4=6x+4
11x=0
x=0
2) 8-6x+12=5x-x-1
20-6x=4x-1
21=10x
x=21/10
3) 8+3x-2=5x-3x+5
6-3x=2x+5
1=5x
x=1/5
J'espère que tu as compris; il faut que tu apprennes un peu ta leçon avant.