$25x^2+9y^2-18y-216=0$
$17\left(-33\right)$
$\left(2x+y\right)\cdot\left(3x-y\right)$
$2xy\left(1+y^2\right)$
$23x=92$
$\frac{sin\left(x\right)}{cos\left(x\right)}\:=-\frac{2}{5}$
$\left(x+\frac{2}{5}\right)\left(x-\frac{3}{4}\right)$
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