4x-(3-x) = 7(x-3) +10 how do i get the answer 4

4x-(3-x) = 7(x-3) +10

4x - 3 + x = 7x - 21 + 10
5x - 7x = 10 + 3 - 21
-2x = -8
x = 8/2
x = 4