$y+5x+7+9y+10$
$\lim_{x\to0}\left(\frac{2x^2}{x^3-x^4}\right)$
$\sin\left(z\right)\cos\left(z\right)\left(\csc\left(z\right)+\sec\left(z\right)\right)$
$\int\left(t-5\right)e^tdt$
$x^2=12x+9$
$2x-3x-36$
$2x^2-20x+17=0$
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