$\left(3x^4y^{-2}\right)^{-3}$
$\:\:-\:636.\:-24$
$\frac{32y^{15}-243}{y^2-3}$
$7a-9b+6a-4b-ab$
$\lim_{x\to0}\left(\frac{7}{x}-\frac{4}{sin\left(3x\right)}\right)$
$x^2-16h^2$
$-\frac{3x^2y^6m}{5}\:+\frac{m^4}{4}-9x^4y^{12}$
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