Add.-6mn + 7mn2 - 5m2n2 and 
A. -9mn + 17m2n + 4m2n2
B. 12m2n2
C. 4m2n2 + 10m2n + 7mn2 - 9mn
D. -3mn + 7mn2 + 10m2n + 4m2n2
Answer: C
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