We know that if we multiply ■ on the outside of the parentheses with each of the items on the inside of the parentheses, we will get ■p and 30. Well... what multiplies by 6 to give us 30? Yep, 5. So we know the ■ on the outside of the parentheses is a 5. So now if we multiply 5 by 8p, we get 40p for the other ■. Final equation...
5 (8p + 6) = 40p + 30
