$2\left(6x+2y\right)$
$\left(x-2\right)\left(x-3\right)\left(x-1\right)$
$\frac{1}{3}<-x-\frac{5}{6}$
$\frac{2}{\left(x+4\right)+\left(x+1\right)^2}$
$x^2-2x-15=22$
$1-169a^2b^2$
$\left(2x^2-\:3a\:\right)^2$
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