Find the Sum or Difference $$\left( 7 x ^ { 6 } + 6 x ^ { 8 } - 7 + 4 x ^ { 7 } \right) - \left( - 1 + 8 x ^ { 7 } + 8 x ^ { 8 } - 9 x ^ { 6 } \right)$$

Find the sum or difference.
- $$\left( 7 x ^ { 6 } + 6 x ^ { 8 } - 7 + 4 x ^ { 7 } \right) - \left( - 1 + 8 x ^ { 7 } + 8 x ^ { 8 } - 9 x ^ { 6 } \right)$$

A) $14 x ^ { 8 } + 12 x ^ { 7 } - 2 x ^ { 6 } - 6$
B) $14 x ^ { 8 } + 12 x ^ { 7 } - 2 x ^ { 6 } - 8$
C) $- 2 x ^ { 8 } + 12 x ^ { 7 } - 2 x ^ { 6 } - 8$
D) $- 2 x ^ { 8 } - 4 x ^ { 7 } + 16 x ^ { 6 } - 6$

Correct Answer:

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