Addition Brain Teaser

Challenging math puzzle game where all you have to do is add up all the numbers on the board. But there is a catch because you can only add equal numbers or numbers whose sum is equal to the number already on the board. For example, you can add 3 and 3 together because they are equal. If there is a 7 on the board, you can combine 5 and 2 together. Although 5 and 2 are not equal, their sum is 7, which is on the board.