$|-4\:+\:5|$
$\frac{z^2-18z}{z}$
$\left(5x^3+\frac{1}{2}\right)^2$
$\int\frac{e^x}{3+4e^x}dx$
$4+3+-2+-1$
$\int\left(\frac{x^3-2x-1}{x^2}\right)dx$
$\frac{1}{x^2}+x^2$
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