$x^2-65x$
$560.\left(-63+23\right)$
$-3m^2n^3+7m^2n^3-9m^2n^3+2m^2n^3$
$\sqrt{x+20}=\:3$
$\left(3m^2+8n^4\right)^2$
$\left(a-x\right)\left(x+a\right)$
$2a^2x-6ax^2$
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