Réponses

2013-05-04T14:04:58+02:00

6+2(x-5)=3(-x+5)

 

6+2x-10 = -3x + 15

2x + 3x = 15 - 6 + 10

5x = 19

x = 19 / 5

2013-05-04T14:14:23+02:00

Tu dois développer chaque parenthèse :

6 + 2(x - 5) = 3(-x + 5)

6 + 2x - 10 = -3x + 15

2x - 4 = -3x + 15

2x - 4 + 4 = -3x + 15 + 4

2x + 3x = -3x + 19 + 3x

5x / 5 = 19 / 5

x = 3,8