$\left(15x+5\right)\left(15x-5\right)$
$\frac{4am-4bm+10cm}{2m}$
$\frac{169m^6-16n^6}{13m^3+4n^3}$
$16\cdot\sqrt{18}$
$9a-2a-4a$
$-9+-1+-2+-16$
$\left(2x^{2\:}+3\right)^2$
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