$-813:-3$
$\left(7x\:+\:2\right)\:\left(7x\:-\:4\right)\:$
$4\cos\left(x\right)-2\sin\left(x\right)$
$2a^3-8^2b+8b^2$
$6a-2b-22$
$\left(2x-3y\right)\left(2+3y\right)$
$-12q-9$
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