Find the Sum or Difference $$- \left( 2 x ^ { 3 } + x - 7 \right) + \left( 4 x ^ { 3 } + 3 x ^ { 2 } \right) - \left( 7 x ^ { 2 } - 9 x - 1 \right)$$

Find the sum or difference.
- $$- \left( 2 x ^ { 3 } + x - 7 \right) + \left( 4 x ^ { 3 } + 3 x ^ { 2 } \right) - \left( 7 x ^ { 2 } - 9 x - 1 \right)$$

A) $6 x ^ { 3 } - 10 x ^ { 2 } + 8 x - 8$
B) $1 x ^ { 3 } - 2 x ^ { 2 } - 8 x + 8$
C) $2 x ^ { 3 } + 4 x ^ { 2 } + 10 x - 8$
D) $2 x ^ { 3 } - 4 x ^ { 2 } + 8 x + 8$

Correct Answer:

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