Réponses

2013-05-02T16:38:56+02:00

2x+1=5-x

2x+x=5-1

3x=4

x=4/3

 

x+3=5x+9

x-5x=9-3

-4x=6

x=6/-4

x=-1.5

 

x/3+7=-x/6

2x/6+42/6=-x/6

2x+42=-x

2x+x=-42

3x=-42

x=-42/3

x=-14

 

4-5x=-3(x-8)

4-5x=-3*x-3*(-8)

4-5x=-3x+24

-5x+3x=24-4

-2x=20

x=20/-2

x=-10