$17y-5x+13y+5x$
$\left(\left(3y^{-2}z^2\right)^5\right)^{-1}$
$\int\frac{4}{cos\left(x\right)}dx$
$\frac{x-1}{3x^1+2x^3+2x^2-x-6}$
$\lim_{x\to0}\left(x^2+x-1\right)$
$\lim\:_{x\to\:\:3}\left(\frac{x^2-9}{x-3}\right)$
$\frac{9x^{2}y^{8}}{9xy^{4}}$
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