$-8y\:+\:5\:-\:3y\:-\:5$
$-20\:\:\left(-5\right)\:-2$
$6n-20=3n+7$
$\frac{x^6-27z^3}{x^2-3z}$
$-csc^2x+cotx$
$\left(\frac{1-m^4}{1-m^2}\right)$
$16x^2y^2-8x^2y-24x^4y^2-40x^2y^3$
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