This is an easy algebraic problem. All you need to do is to follow the steps below.
4x + 3(2 - x) = 8 - 2x
4x + 6 - 3x = 8 - 2x
x - 6 = 8 - 2x
3x = 14
x = 14/3 = answer
4x + 3(2 - x) = 8 - 2x
4x + 6 - 3x = 8 - 2x
x - 6 = 8 - 2x
3x = 14
x = 14/3 = answer