Réponses

2012-05-05T12:10:23+02:00

2x-7+7= 8x-3+7

2x=8x+4

2x-8x=8x+4-8x

-6x=4

-x=4/6

x=-4/6

2012-05-05T12:19:23+02:00

a. 3a-5=4+3a

3a-3a=4+5

a=9

 

 

b. 2x-7=8x-3

-7+3=8x-2x

-4=6x

6x=-4

x=-0,66