Some equations have letters on each side of the equals sign, for example: .
Solve this equation by rearranging all the letters onto one side of the equation and all numbers onto the other side. The easiest way to do this is usually by moving the unknown with the smallest coefficient in the equation (the letter with the smallest number in front of it).
Expand the bracket:
Decide which of the unknowns has the smallest number in front of it. 4 is less than 12 so subtract from each side.
Isolate the term on the right hand side by adding 4 to each side:
Isolate by dividing each side by 8:
Substituting back into the original equation gives:
Left hand side:
Right hand side:
The equation balances, so is the correct answer.