$y-3xy+3y^2+y$
$x^2-8x\:+\:15=0$
$-4+4\left(-2+7\right)\left(-5\right)$
$7-2-\left(6-5\right)$
$\frac{3x-1}{2}+5=2x+3$
$\left(\frac{1}{3}b^3a\right)^3$
$un=\left\{\left(-2\right)^n\right\}n^30$
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