Réponses

2013-03-17T17:37:03+01:00
1) 3x+4=40
3x=36
x=36/3
x=12

2) 6x+7=19+3x
3x=12
x=12/3
x=4

3) 10x(-5)=30
10x=25
x=25/10
x=2.5

4) 4x+19=100-5x
9x=81
x=81/9
x=9

5) 5x-1=2x+2
3x=3
x= 3/3 x = 1