Find the Sum or Difference $$\left( - 4 - 4 x ^ { 5 } + 3 x ^ { 7 } + 2 x ^ { 6 } \right) + \left( - 6 x ^ { 6 } - 2 x ^ { 5 } - 5 + 4 x ^ { 7 } \right)$$

Find the sum or difference.
- $$\left( - 4 - 4 x ^ { 5 } + 3 x ^ { 7 } + 2 x ^ { 6 } \right) + \left( - 6 x ^ { 6 } - 2 x ^ { 5 } - 5 + 4 x ^ { 7 } \right)$$

A) $7 x ^ { 7 } - 4 x ^ { 6 } - 6 x ^ { 5 } - 9$
B) $7 x ^ { 14 } - 4 x ^ { 12 } - 6 x ^ { 10 } - 9$
C) $- 10 x ^ { 7 } - 10 x ^ { 6 } - 2 x ^ { 5 } + 6$
D) $- 3 x ^ { 36 } - 9$

Correct Answer:

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