First, turn both expressions into an equation 6a-4=2a+56 --------------- Now solve Subtract 2a from each side 6a-4-2a=2a+56-2a 4a-4=56 ---------------------- Add 4 to each side 4a-4+4=56+4 4a=60 --------------------------- Divide each side by 4 4a ÷ 4 = 60 ÷ 4 a = 15
