Exercice 1 svp urgent je n'arrive pas

7x-5=2x+10
7x-2x=10-5
5x=5
x=5/5
x=1

5x+7=-3x+17
5x+3x=-7+17
8x=10
x=10/8=5/4

2x-(-4-3x)=5+(7x-1)
2x+4+3x=5+7x-1
4+1-5=-2x-3x+7x
0=2x
x=0