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Meilleure réponse !
2013-03-18T17:33:23+01:00

N°10

 

5x -2 = -7

5x = -7 +2

5x = -5

x = -1

 

9x -64 = -1

9x = -1 +64

9x = 63

x = 7

 

3x+2 = x+6

3x-x = 6-2

2x = 4

x = 2

 

-8x+3 = 5x-2

-8x -5x = -2-3

-13x = -5

x = 5/13

2013-03-18T17:35:43+01:00