Perform the indicated operation.(6n7 + 4n + 5n6) + (-8n6 + 9n7 - 7n)
A. 15n - 3n7 - 3n6
B. 15n7 - 3n6 - 3n
C. 13n7 - 2n6 - 2n
D. 9n14
Answer: B
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