$x^2\:-\:10x\:=\:39$
$\frac{x^{-3}+y^{-3}}{\left(x^{-2}+y^{-2}\right)}$
$\left(27\cdot13\right)+\left[16\cdot\left(-6\right)\right]-\left[74\cdot\left(-58\right)\right]$
$\frac{1}{x-5}+\frac{1}{x^2-25}$
$-4\:+\left(5-4\right)+2+\left(-8\:+1\right)$
$4x\frac{dy}{dx}+y=3xy^{-2}$
$\frac{1}{2}+\frac{15}{2x-7}-\frac{3x-5}{x^2-7x}\:$
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