Réponses

2013-03-24T15:57:31+01:00

2x-3 = 5x-12

2x-5x = -12+3

-3x = -9

x = 3

 

5(x-2) = -x+7(x-1)

5x-10 = -x+7x-7

5x+x -7x = -7-10

-x = -17

x = 17

2013-03-24T15:59:53+01:00

2x - 3 = 5x - 12

2x - 3 + 3 = 5x - 12 + 3

2x - 5x = 5x - 9 - 5x 

- 3x /-3 = - 9 / - 3

x = 3

 

5(x - 2) = -x + 7(x - 1)

5x - 10 + 10 = -x + 7x - 7 + 10

5x - 6x = 6x + 3 - 6x

-x = 3

x = - 3