$$n2y2-3n2x+5y2-15x$$
$\left(n_{2}+5\right)\left(y_{2}-3x\right)$
$$n_{2}\left(-3x+y_{2}\right)+5\left(-3x+y_{2}\right)$$
$$\left(-3x+y_{2}\right)\left(n_{2}+5\right)$$
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