$\left(z-x\right)\left(z+x\right)$
$\frac{2x}{5}+\frac{4z}{5}-\frac{2x}{5}$
$\frac{6-x\cdot13-x}{2}$
$y'+y=3$
$3x-2<-3$
$\frac{z^{-5}r^2}{r^3z^2}$
$\int sin\:\left(3x+9\right)\:dx$
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