Four siblings buy a gift for their father on his birthday. Each sibling contributes (pays) the same amount of money towards the gift. The gift ends up coming to $63 and after paying for the gift, there is some money left over which the siblings equally split.

Write an expression to represent the amount of money each sibling will get back after the gift is paid for. Use x to represent the amount of money paid by each sibling.

If each sibling contributed $18 towards the gift, how much money did each sibling get back?

tip: they have paid a total of 40 dollars, so subtract what they bought, which should be 3 times each of the items added together.