Répondre :
Bonsoir,
a.3x=2x+5
3x-2x = 5
x= 5
b.4-5x=9x
4= 9x+5x
4 = 14x
x= 4/14
x= 2/7
c.4x+2=x+11
4x-x + 11-2
3x= 9
x= 9/3
x=3
d.3x-7=-2x-9
3x+2x = 7-9
5x = -2
x= -2/5
e.5x-1=7x-1
-1+1 = 7x-5x
0=2x
x= 0
f.3x-2+x=6+4x
-2-6 = 4x -3x
x= -8
Bonsoir,
a.3x=2x+5
3x-2x = 5
x= 5
b.4-5x=9x
4= 9x+5x
4 = 14x
x= 4/14
x= 2/7
c.4x+2=x+11
4x-x + 11-2
3x= 9
x= 9/3
x=3
d.3x-7=-2x-9
3x+2x = 7-9
5x = -2
x= -2/5
e.5x-1=7x-1
-1+1 = 7x-5x
0=2x
x= 0
f.3x-2+x=6+4x
-2-6 = 4x -3x
x= -8