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Find the Sum or Difference $\left( 2 n ^ { 7 } - 9 n - 7 n ^ { 6 } \right) + \left( - 4 n ^ { 6 } + 5 n ^ { 7 } - 6 n \right)$

Question 253

Multiple Choice

Find the sum or difference.
- $\left( 2 n ^ { 7 } - 9 n - 7 n ^ { 6 } \right) + \left( - 4 n ^ { 6 } + 5 n ^ { 7 } - 6 n \right)$

A) $7 n - 11 n ^ { 7 } - 15 n ^ { 6 }$
B) $- 19 n ^{14}$
C) $- 4 n ^ { 7 } - 2 n ^ { 6 } - 13 n$
D) $7 n ^ { 7 } - 11 n ^ { 6 } - 15 n$

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