Simplify:
$[3 a^{2} - 2 a^{2} + 9 a^{2} - {6 a^{2} - (- 2 a^{2} + 3 a^{2})}]$

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Solution

$[3 a^{2} - 2 a^{2} + 9 a^{2} - {6 a^{2} - (- 2 a^{2} + 3 a^{2})}]$

$= 3 a^{2} - 2 a^{2} + 9 a^{2} - {6 a^{2} - a^{2}}$

$= 3 a^{2} - 2 a^{2} + 9 a^{2} - 5 a^{2}$

$= 5 a^{2}$

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