Find the sum or difference.
-$$- \left( 6 x ^ { 3 } + x - 7 \right) + \left( 8 x ^ { 3 } + 4 x ^ { 2 } \right) - \left( 9 x ^ { 2 } - 5 x - 1 \right)$$
A) $1 x ^ { 3 } - 3 x ^ { 2 } - 4 x + 8$
B) $2 x ^ { 3 } - 5 x ^ { 2 } + 4 x + 8$
C) $14 x ^ { 3 } - 13 x ^ { 2 } + 4 x - 8$
D) $2 x ^ { 3 } + 5 x ^ { 2 } + 6 x - 8$

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The Answer of Find the sum or difference.
-$$- \left( 6 x ^ { 3 } + x - 7 \right) + \left( 8 x ^ { 3 } + 4 x ^ { 2 } \right) - \left( 9 x ^ { 2 } - 5 x - 1 \right)$$
A) $1 x ^ { 3 } - 3 x ^ { 2 } - 4 x + 8$
B) $2 x ^ { 3 } - 5 x ^ { 2 } + 4 x + 8$
C) $14 x ^ { 3 } - 13 x ^ { 2 } + 4 x - 8$
D) $2 x ^ { 3 } + 5 x ^ { 2 } + 6 x - 8$

Find the Sum or Difference −(6x3+x−7)+(8x3+4x2)−(9x2−5x−1)- \left( 6 x ^ { 3 } + x - 7 \right) + \left( 8 x ^ { 3 } + 4 x ^ { 2 } \right) - \left( 9 x ^ { 2 } - 5 x - 1 \right)−(6x3+x−7)+(8x3+4x2)−(9x2−5x−1)

Find the Sum or Difference $- \left( 6 x ^ { 3 } + x - 7 \right) + \left( 8 x ^ { 3 } + 4 x ^ { 2 } \right) - \left( 9 x ^ { 2 } - 5 x - 1 \right)$