$-9\left(z-99\right)=9$
$9c+9d^2$
$x^2+18x-4=0$
$18.25-7h>4.25$
$\left(5-z^2\right)^3$
$\int7x^3\sqrt{5-x^4}dx$
$\frac{dy}{dx}+\frac{y}{x+1}=-\frac{1}{2}\left(x+1\right)^3y^2$
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