Simplify $p^{2} x - 2 {p x - 3 x (x^{2} - 3 a - x^{2})}$

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Solution

$p^{2} x - 2 {p x - 3 x (x^{2} - 3 a - x^{2})}$

$= p^{2} x - 2 {p x - 3 x (- 3 a)}$

$= p^{2} x - 2 {p x + 9 x a}$

$= p^{2} x - 2 p x - 18 x a$

$= x (p^{2} - 2 p - 18 a)$

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