1. (1 + 5) + 2 = 2 + (1 + 5). [commutative property of addition]
2. 5(2x + 3) = 10x + 15. [ distributive property]
3. (2*x) x 7 = 2 x (x*7). [associative property of multiplication]
4. (3 x x x 4) = (3 x 4 x x). [ commutative property of multiplication]
5. (4 + 2) + 6 = 4 + (2 + 6). [associative property of addition]
