$5a+2a+2a-5a+3a-1=13$
$\lim_{x\to\infty}\left(\frac{x\cdot lnx}{x^2+1}\right)$
$8r+10-11s-7-18s$
$\frac{d}{dx}\left(\frac{\arcsin\left(x^4\right)}{x^5}\right)$
$\left|1+\frac{6}{n}+\frac{9}{n^2}-1\right|$
$\left(+5-7\right)^2-\left(+3-8\right)^2-\left(+6-9\right)^3-\left(+7-9\right)^2$
$1\:-3\:1\:3$
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