1 + (8 + 6) = (1 + 8) + 6
9 * 3 = 3 * 9
4(8 + 7) = 4*8 + 4*7
6 (7 + 2) = 6*7 + 6*2
7 + 2 = 2 + 7
(9 * 3) * 2 = 9 * (3 * 2)
5 * (9 * 7) = (5 * 9) * 7
8 * 4 = 4 * 8
5 ( 2 + 3) = 5*2 + 5*3
9(1 + 6) = 9*1 + 9*6
3 + 5 = 5 + 3
6 + (5 + 4) = (6 + 5) + 4
