$9x-3\le0$
$\frac{5x^2+4x}{2x+5}$
$\frac{z^2+z}{z+2}$
$\left(10-5x\right)^2$
$\frac{5x}{x+3}=3+\frac{1}{x+3}$
$x^{-10}\cdot x^4$
$\int x\sqrt{1+x^4}dx$
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