(8 x 4) x 7 = 8 x (4 x 7)
5 x 4 = 4 x 5
(-10 x 2) x 3 = -10 x (2 x 3)
5 x (-6 + 4) = (5 x -6) + (5 x 4)
10 x -12 = -12 x 10
(4 + 3) x 7 = (4 x 7) + (3 x 7)
2 x (6 - 2) = (2 x 6) - (2 x 2)
