The first thing to do is to collect the variables to one side of the equation and the constant numbers to the other side.
If there is a common factor on both sides of the equation, you can also divide both sides by that common term to further simplify the equation.
The important thing to remember is an equation is like a lever in balance. Therefore, to maintain that balance, you need to apply the same operation to both sides of the equation. Otherwise, the balance will be broken.
I would say the best way to improve on this subject is to solve as many questions as possible until applying the above recipe becomes a reflex for the student.