$\frac{18}{3}+\left\{4^2-\left(3+\frac{12}{3}\right)\right\}+9$
$\left(+432\right)+\left(-178\right)$
$3x\:+\:2y\:+\:4\:+\:9y$
$m^2-4m-5$
$\left(4x^3y-2xy^4\right)^3$
$\lim_{x\to x}\left(\frac{-3e^{x^2}-4}{x^2+2}\right)$
$\frac{-x^3+x^2-2}{-x^3-x+1}$
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