$\left(7x+7\right)\left(3x-1\right)$
$5-8\cdot6+3$
$\left(3x^{10}-9z^8\right)\left(3x^{10}+9z^8\right)$
$2x^3-2x^2-4x+16$
$+3\cdot\left(3+5\cdot5+2\right)$
$339-3430$
$-3h-12+4h-8$
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