Add.(3 + 7n6 - 3n5) + (2n6 - 9n5 - 2)
A. 9n6 - 12n5 + 1
B. 9 - 12n6 + 1n5
C. 5n6 - 2n5 - 5
D. -2n11
Answer: A
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D. 
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