Réponses

2013-04-02T18:36:14+02:00

(2x+1) = (x-3)

2x-x = -3-1

x = -4

 

2x-14 = 4x+15

2x-4x = 15+14

-2x = 29

x = -29/2

 

2x-2 = 6+3x

2x-3x = 6+2

-x = 8

x = -8

2013-04-02T18:36:48+02:00

(2x + 1) - (x - 3) = 0

2x + 1 - x + 3 = 0

x + 4 - 4 = 0 - 4

x = -4

 

2(x - 7) = 4x + 15

2x - 14 - 4x = 4x + 15 - 4x

-2x - 14 + 14 = 15 + 14

-2x / -2 = 29 / -2

x = - 14,5

 

2(x - 1) = 3(2 + x)

2x - 2 - 3x = 6 + 3x - 3x

-x - 2 + 2 = 6 + 2

-x = 8

x = - 8