24=2(2x+6)

Question

12-3(2x-6)=(-2x+6)+2

-(x-5)+2/3=2(x+5)

Answer 1

24=2(2x+6)

24 = 4x + 12
12 = 4x
3 = x

Now you can try the others.

I'll be glad to check your answers.