$7x-7\cdot x-9$
$34.7\sqrt{4789}$
$\left(3+n\right).\left(7-m\right)$
$-14=3$
$\left(3m\:+\:4\right)\left(3m\:-\:4\right)$
$\frac{\left(x+1\right)}{x^2-2x-8}$
$\left(b^2-1\right)^3$
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