The rules for solving an equation are:
Use the distributive law to get rid of the parenthesis
Using the method of addition and subtraction, you can put the variables to the left-hand side of the equation and the constant to the right-hand side.
Make sure to use the opposite sign of addition or subtraction every time you take one term to the other side of the equal sign
Combine the variable terms and the constant terms
Finally, divide both sides of the equation with the numerical coefficient of the variable to isolate it.