Bjr j besoin d'aide svp 1) 10x+x+2=30-8 2) 2(x+2)=x-10 3) 10x+2=4(x-2)

Bonjour,

1) 10x+x+2=30-8
10x + x = 30 - 8 - 2
11x = 30 - 10
11x = 20
x = 20/11

2) 2(x+2)=x-10
2x + 4 = x - 10
2x - x = - 10 - 4
x = - 14

3) 10x+2=4(x-2)
10x + 2 = 4x - 8
10x - 4x = - 8 - 2
6x = - 10
x = -10/6
x = - 5/3

    10x + x + 2 = 30 - 8
⇒ 11x + 2 = 22
⇒ 11x = 22 - 2 = 20
⇒ x = 20/11

     2(x+2) = x-10
⇒ 2x+4 = x-10
⇒ 2x-x = -10-4
⇒ x = -14



     10x+2 = 4(x-2)
⇒  10x+2 = 4x-8
⇒  10x-4x = -8-2
⇒  6x = -10
⇒ x = -10/6 = -5/3