$\left(3z-1\right)^2$
$\left(x+3\right)^2+4=40$
$\frac{y+3}{x}+\frac{x-1}{y}$
$\left(7^4\right)^7$
$3y^2-12y=0$
$\frac{12x^9\:y^{10}}{4x^7\:y^5}$
$\lim_{x\to0}\left(\frac{x^2exp\left(x\right)}{\left(exp\left(x\right)-1\right)^2}\right)$
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