Bonjour m'aider !! 4×+1+2 (5+×)=×+71

4x + 1 + 2(5 +x) = x + 71
4x + 1 + 10 + 2x = x + 71
7x = 71 - 1 - 10
7x = 60
x = 60/7

4x+1+2(5+x)=x+71
4x+1+10+2x=x+71
4x+2x-x=-1-10+71
6x-x=-11+71
5x=60
x=60/5
x= 12