$4^3\cdot4^{-1}$
$\frac{m^3n^{-5}}{m^{-2}n^{-2}}$
$\left(-2a^7b^{-9}\right)$
$19-\left(-24\right)$
$\frac{d}{dx}cos\frac{3x}{2}$
$x^2-4x>0$
$x-6=10$
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