By simplifying, combining like terms, then rearranging to isolate x.

Here's the important first step. Remember that when you subtract an expression in parentheses, that multiplies everything inside the parentheses by -1, changing the sign.

Example: 5 - (4 - x) = 5 + (-1)(4 - x) = 5 + (-4) + x = 1 + x

Example: 5 - (2 + x) = 5 + (-1)(2 + x) = 5 + (-2) + (-x) = 3 - x

Do that with your left hand side.