$3 - [x - {2 y - (5 x + y - 3) + 2 x^{2}} - (x^{2} - 3 y)]$

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Solution

$3 - [x - {2 y (5 x + y - 3) + 2 x^{2}} - (x^{2} - 3 y)]$

$3 - [x - {2 y - 5 x - y + 3 + 2 x^{2}} - x^{2} + 3 y]$

$3 - [x - {2 x^{2} + y - 5 x + 3} - x^{2} + 3 y]$

$3 - [x - 2 x^{2} - y + 5 x - 3 - x^{2} + 3 y]$

$3 - [- 3 x^{2} + 6 x + 2 y - 3]$

$3 + 3 x^{2} - 6 x - 2 y + 3$

$3 x^{2} - 6 x - 2 y + 6$

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