Find the Indicated Sum or Difference$$\left( - 2 z ^ { 2 } - 8 z - 1 \right) + \left( z ^ { 2 } + 2 z - 5 \right) - \left( 9 z ^ { 2 } - 19 z + 9 \right)$$

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Find the Indicated Sum or Difference $\left( - 2 z ^ { 2 } - 8 z - 1 \right) + \left( z ^ { 2 } + 2 z - 5 \right) - \left( 9 z ^ { 2 } - 19 z + 9 \right)$

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Find the Indicated Sum or Difference (−2z2−8z−1)+(z2+2z−5)−(9z2−19z+9)\left( - 2 z ^ { 2 } - 8 z - 1 \right) + \left( z ^ { 2 } + 2 z - 5 \right) - \left( 9 z ^ { 2 } - 19 z + 9 \right)(−2z2−8z−1)+(z2+2z−5)−(9z2−19z+9)

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Find the Indicated Sum or Difference $\left( - 2 z ^ { 2 } - 8 z - 1 \right) + \left( z ^ { 2 } + 2 z - 5 \right) - \left( 9 z ^ { 2 } - 19 z + 9 \right)$

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