$-m\:-n\:=\:-7$
$5x-2y=20$
$-8x-8y=-64$
$\int2\pi\sqrt{1+x^2}dx$
$\frac{\left(3x^{2}\right)\left(3x^{-1}\right)^{2}}{\left(12y^{3}\right)\left(5y^{-1}\right)}$
$x^2-9x+27$
$\frac{d}{dx}e^{x^2}-y$
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