Résoudre les équations

a) 7x-2=5
7x=7
x=1

b)8=8-3x
3x=0
x=0

a)3x-7=2x+9
x=16

b)32-15x=-18+10x
-25x=-50
x=2

c)1,5x=3,5x-10
-2x=-10
x=4

a)
7x - 2 = 5
7x = 5 + 2
7x = 7
x = 7/7
x = 1

b)
8 = 8 - 3x
- 3x = 8 - 8
- 3x = 0
x = 0

c)
x/10 = 16,5
x = 16,5 * 10
x = 165

d)
x/2 = - 15/2
x = - 15

a)
3x - 7 = 2x + 9
3x - 2x = 9 + 7
x = 16

b)
32 - 15x = - 18 + 10x
- 15x - 10x = - 18 - 32
- 25x = - 50
x = 50/25
x = 2

c)
1,5x = 3,5x - 10
1,5x - 3,5x = - 10
 - 2x = - 10
x = 10/2
x = 5

d)
x/2 + 14 = - x/2 - 3
x/2 + 28/2 = - x/2 - 6/2
x/2 + x/2 = - 6 - 28
2x = - 34
x = -34/2
x = - 17