$\frac{1}{\left(1-z^{-1}\right)\left(1-0.5z^{-1}\right)}$
$e^{2x}\frac{dy}{dx}=e^{4y}$
$-2^7$
$5 - 7 + ( 7 - 3 ) - ( 2 + 56 ) + 3$
$9x^2y^2-36z^6$
$\frac{d}{dx}\:y\:=\:xy$
$xy^2+3x^2\:y+2xy$
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