$2\frac{dz}{dx}=xz$
$a-b-a+b$
$\frac{s}{\left(s^2+4\right)\left(s^2+16\right)}$
$\left(1x^6yz\right)^{15}$
$\frac{m^9+n^9}{m-n}$
$\left(1-\frac{x}{3}\right)^4$
$\left(2x^2\:\right)\left(5xy^3\:\right)\:$
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