Question

10x-5(1+x)=3(2x-2)-20

Answer 1

10x-5-x=6x-6-20
9x-5=6x-26
9x-6x=-26+5
3x=-21
x=-21/3
x=-7

Answer 2

10x - 5 - 5x = 6x - 6 - 20
10 x - 5x - 6x= 5 - 20 -6
-x = - 15 - 6
-x = - 21 
x=21