Sagot :
a) x=12/3 = 4
d) x = -9 + 4 = -5
b) x= -9
e) 3x +1 = 20x - 8 donc x = 9/17
c) x=2
f) 7x = 2x + 6 donc x= 6/5
a) 3x=12
x=12/3
x=4
d) 3x -4=2x -9
3x - 2x= 4-9
x= -5
b) 2x + 11= -7
11+7 = 2x
18 = 2x
9=2x
e) 3x + 1/4 =5x -2
5x-3x =1/4 -2
2x = 0.25 -2
2x= -1.75
x= -0.8
c) 3-x=1
x=1-3
x=-2
f) 7x / 2 =x +3/2
7/2 x 2 = x+ 3/2 x2
7 = x+ 3
x = 7-3
x = 5