Add or subtract horizontally.(3n7 - 6n4 - 11) - (9n7 - 20n4 + 17)
A. -6n7 + 14n4 + 6
B. -20n11
C. -6n7 + 3n4 + 6
D. -6n7 + 14n4 - 28
Answer: D
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