Besoin d'aide svp Résoudre les équations suivantes: a) -3x+4=2x-1 b) x+3=-5x+9 c) x/2-5=x+7 Merci

1) -3x+4=2x-1
2x+3x=4+1
5x=5
x=5/5
x=1
b) x+3 =-5x+9
x+5x=9-3
6x=6
x=6/6
x=1
c) x/2 - 5 = x + 7
-7-5=x - x/2
x/2=-12
x=-24

a) 
- 3x + 4 = 2x - 1
- 3x - 2x = - 1 - 4
- 5x = - 5
x = - 5 / -5
x = 1

x + 3 = - 5x + 9
x + 5x = 9 - 3
6x = 6
x = 6 / 6
x = 1

x/2 - 5 = x + 7
x/2 - x = 7 + 5
- 0,5x = 12
x = 12/- 0,5
x = - 24