$2n-3-n^2$
$\left(\:-2\right)x\:9-6x\left(-3\right)$
$x^2\frac{dy}{dx}-xy-y=0$
$xdy-ydx=ydy$
$\left(3a-5x\right).\left(3ab+2\right)$
$\left(4m-3n\right)\left(3m-2n\right)$
$-27:\:-81$
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