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b.9m +4mn +(-12m) -7mn = -3m -3mn = -3(m+mn)
c.-3a^2 +5ab -11
b. 9m - 12m + 4mn - 7 mn = -3m-3mn
c. 2a²-5a²+3ab+2ab-7-4 = -3a²+5ab-11