Sagot :
3x + 2 = 2x - 5
x = - 7
-5x + 4 = 6x + 8
11x = -4
x = -4/11
-4(3 + x) = 2x - 6
-12 - 4x = 2x - 6
-6x = 6
x = -1
7x = 2 - 3x
10x = 2
x = 1/5
3x+2=2x-5
3x+2-2x=2x-5-2x
1x+2=-5
1x+2-2=-5-2
1x=-7
x=-7/1
x=-7
-5x+4=6x+8
-5x+4-6x=6x+8-6x
-11x+4=8
-11x+4-4=8-4
-11x=4
x=4/-11
-4(3+x)=2x-6
-4*3-4*x=2x-6
-12-4x=2x-6
-12-4x-2x=2x-6-2x
-12-6x=-6
-12-6x+12=-6+12
-6x=6
x=6/-6
x=-1
7x=2-3x
7x+3x=2-3x+3x
10x=2
x=2/10
x=0.2
voilà...... :)