Simplify :
$a^{2} + b^{2} - 2 a^{2} + c^{2} + 4 a$

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Solution

$a^{2} + b^{2} - 2 a^{2} + c^{2} + 4 a$ = $- a^{2} + b^{2} + c^{2} + 4 a$

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