$9-\left\{6-\left[\left(-32\:-\:15\:+8\right)-22\:\right]-7\right\}$
$25m^2-10mn+n^2$
$a^2-8a+15$
$125-225x^2y+135xy^2-27^3$
$x^2y-xy\cdot xy^2-4xy$
$\left(3\cdot10^3\right)\left(7\cdot10^6\right)$
$\frac{2x}{3}\:-5\:>\frac{3x}{2}\:-2$
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