Réponses

2012-09-19T11:07:21+02:00

5x + 1=2x+19

5x + 1 -1 = 2x +19 -1

5x = 2x + 18

5x - 2x = 2x -2x +18

3x = 18

3x/3 = 18/3

x = 6

 

8(x+3)=x+15

8*x + 8*3 = x+15

8x + 24 = x+15

8x - x +24 = x -x +15

7x + 24 = 15

7x + 24 -24 = 15 - 24

7x = -9

x = -9/7


Le dernier est a verifier parce que ça me parait bizare