$\frac{x^{-4}y^6y^3}{x^{-7}}$
$-51-\left(-60\right)$
$25\:-\left(8\:+4\cdot2\:+-5\right)$
$-n+4-9-5n$
$\frac{d}{dx}y=5e^{9-7x}$
$x^2y^08$
$\left(x^5-\frac{3}{8}\right)\left(x^5-\frac{7}{8}\right)$
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