$\left(18\:\cdot2300\right)\:+\:\left(24\:\cdot2000\right)$
$-2n-3n$
$1+-3+-3+-7$
$5\left(a+2\right)$
$\lim_{n\to\infty}\left(\frac{e^n}{n^2}\right)$
$4x^2-12x+2$
$36a^2b^6-64$
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