$20ax-5bx-2by+8ay$
$200x^2-1250$
$\left(\frac{1}{3}x-\frac{2}{3}y\right)\left(\frac{1}{3}x+\frac{2}{3}y\right)$
$y'=xy-2x+y-2$
$\left(3x-2x\right)\left(2xz+2\right)$
$\left(3w\right)\left(w+4\right)\left(w-4\right)$
$1,061\:+\:972$
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