$\frac{x^3-x^2+2x+3}{x^2+1}$
$3x+2y=13$
$3x+2>1$
$\frac{1}{\sqrt{x+9}-2}$
$\frac{1}{2\:}\left(x^2-1\right)+\frac{1}{3\:}\left(x-2\right)\left(x+3\right)-2x^2$
$\frac{p+5}{p^2+p}=\frac{1}{p^2+p}-\frac{p-6}{p+1}$
$\frac{4x^2-2x+3}{2x-1}$
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