$3\left(-7\:-\:8n\right)$
$cy+2x=3$
$\left(a^3-4ab^2+6a\right)\cdot\left(3ab\right)$
$\left(k-m-9km\right)\left(k-m+9km\right)$
$\left(\sqrt[4]{16}\right)\left(-7\right)$
$\sqrt{10}\sec$
$a^2\:-\:2a\:-\:1$
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