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To simplify the expression (7m \cdot 6n - 5m \cdot 8n), first multiply the coefficients: (7 \cdot 6 = 42) and (5 \cdot 8 = 40). This gives us (42mn - 40mn). Now, combine like terms: (42mn - 40mn = 2mn). Thus, the simplified expression is (2mn).
Since 2mn is a factor of 4m2n2, the latter is automatically the GCF.
-7m - 3m + 5m = -5m
5m = 40m = 40/5m = 8
5m 80mm