Résoudre algébriquement chaque équation: . -7x +15=2x-3 . 8+x= -3 . y+1= -3y+4

-7x +15=2x-3
- 7x - 2x = - 3 - 15
- 9x = - 18
x = 18/9
x = 2

8+x= -3
x = - 3 - 8
x = - 11

y+1= -3y+4
y + 3y = 4 - 1
4y = 3
y = 3/4
y = 0,75

bonsoir

- 7 x + 15 = 2 x - 3
- 7 x - 2 x = - 3 - 15
- 9 x = - 18
x = 2

8 + x  = - 3
x = - 3 - 8
x = - 11

y + 1 = - 3 y + 4
y + 3 y = 4 - 1
4 y = 3
y = 3/4