$\left(2x+y+z\right)\left(2x-y+z\right)$
$210^2$
$20y^2+8y$
$26x^2-39x$
$-3x\:-5y$
$\left(x+5\right)^2+\left(x-3\right)\cdot\left(x+3\right)+3x\left(x-2\right)^2$
$\left(5mn^2-3\right)^2$
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