Use properties of operations to determine whether the expressions are equivalent.
19) 7m + 10 + 9m and 16m + 10
20) 2b * 5 and 7b
21) 9 * (4r - 6) and 36r - 54
22) 12 + 5 (2 + y) and 5y + 22
23) 15j + 11 - 6j and 9j + 11
24) 8 (3x + 1) and 24x + 1
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