6m + 20 = 9m - 4
24 = 3m
m = 8
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This question as written can be taken two ways: 9m + 6n - 3m + 7n = 6m + 13n, or (9m + 6n) - (3m + 7n) = 9m + 6n - 3m - 7n = 6m - n
9m + 9m + 3m + 3m = 24m
(9mX6m)2 2916m2 9mX(6m)2 324m3
4m + 9 + 5m - 12 = 42 9m -3 = 42 9m = 42 + 3 9m = 45 m = 5
4m + 9 + 5m - 5 = 42 9m + 4 = 42 9m = 38 m = 38/9