Solve simple one variable equation

We solve simple one variable equation by moving expession from one side to the other side keeping the math rules:

Example

Solve:  8(x – 2) – 5(x + 4) = 20 + x

 8(x – 2) – 5(x + 4) = 20 + x

8x - 16 - 5x - 20 = 20 + x

8x - 5x - x = 20 + 20 + 16

2x = 56

x= 56/2

x = 28