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b. 12a-11ab-7a²
c. 8p²-p-4
d. -2a+5ab+9a²b
e. 16x²-8xy-2y²
f. 3m²n+2mn²-7m²n²+8mn
3a. 4a
b. 8a
c. -8b
d. -3p
e. -6k
f. -5k
g. 2p
h. 27p
i. -12m
j. -10p
k. -8t
l. k