combine the m terms on the left. Add 3 to both sides.
Reorder the terms:
9 + -12 + 4m + 5m = 42
Combine like terms: 9 + -12 = -3
-3 + 4m + 5m = 42
Combine like terms: 4m + 5m = 9m
-3 + 9m = 42
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