$x^2-x-90$
$\left(3x\right)^2-\left(4y\right)^2$
$\lim_{x\to0}\left(\frac{r^5-x^5}{r^2-x^2}\right)$
$7m-3\cdot2m+4$
$2x^3-4x^2+4+x^2-2x+2$
$\left(4ab^2-2ab+3\right)+\left(5c-3ab+7\right)$
$z=e^{xy^2}$
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