$803,246\cdot5,21$
$-2z^2\left(-4z^2+3z+3\right)$
$\left(7am-8\right)^2$
$f^2+6f+11$
$11x+2\:\:11x-2$
$\left(2x+7\right)^2-\left(2x-7\right)^2$
$\left(7x+1\right)\left(12x-9\right)-\left(-x+2\right)$
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