$-15-4-3+5+9-8$
$3x^2y+14x^2y-18x^2y$
$24k^2m\:-\:54m^3$
$\frac{dy}{dx}=-\frac{x^3y}{2}$
$\left(5m^2\right)\left(-3n^2+8\right)$
$3x^24z-3x^24z$
$27\cdot27\cdot27$
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