équations 3(-x+3)-8=(2x+5) 2x+3=7

3(- x + 3) - 8 = (2x + 5)
- 3x + 9 - 8 = 2x + 5
- 3x + 1 = 2x + 5
1 - 5 = 2x + 3x
- 4 = 5x
- 4/5 = x

2x + 3 = 7
2x = 7 - 3
2x = 4
x = 4/2
x = 2

3(- x + 3) - 8 = (2x + 5)
- 3x + 9 - 8 = 2x + 5
- 3x + 1 = 2x + 5
-3x-2x=5-1
-5x=4
x=-4/5
donc x= - 4/5 

2x + 3 = 7
2x = 7 - 3
2x = 4
x = 4/2
donc  x = 2