$\frac{200x-x^2}{20}$
$9c+9d^2$
$4m^4n^3\left(4m^4n^5-4m^3n\right)$
$-169m^4+49n^2$
$x^2-17x+18=0$
$\frac{\left(2x^2-1\right)e^{x^2}}{x^2}$
$5y-4>31$
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