$3z^2-15z+10=0$
$\left(x^2\:-\:7\right)^2$
$\left(12x+5y+7\right)^2$
$\frac{\left(x-2\right)}{n^n}^n$
$\frac{d}{dx}y=e^{3x^4}$
$\left(5n+y\right)^2$
$x^2+1>2x$
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