$20+490+51$
$9-3-16-15+12-11$
$\left(2z+3n\right)\left(2z-3n\right)$
$\left(w+3\right)\left(w+4\right)$
$-x-4x-x-xy-2y-y+y$
$\left(-97\right)\left(47\right)$
$m^2+m-30=0$
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