$10ab-3ab+8c$
$\left(3a^3-4ab^2+2b^3\right)^2$
$50\:-\:\left(-\:40\right)\:-\:\left(\:-20\right)$
$\frac{3x^2y^2}{xy}$
$5sec^2x-10=0$
$4m^4-2m^{-3}$
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