Simplify: $[6 y^{2} - 3 9 y^{2} - 10 y - 2 (3 y^{2} - 5 y) - y^{2}]$

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Solution

$[6 y^{2} - 3 9 y^{2} - 10 y - 2 (3 y^{2} - 5 y) - y^{2}]$
$= [6 y^{2} - 3 9 y^{2} - 10 y - 6 y^{2} + 10 y - y^{2}]$
$= [6 y^{2} - 4 6 y^{2}]$
$= - 40 y^{2}$

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