$17k-15-9$
$3a^2+7a+2$
$-62\ge31u$
$16g+10-4g$
$\frac{5x^9}{x^{20}}$
$2\:\left(x+3\right)-x$
$\frac{\tan\left(\frac{x}{2}\right)+\cot\left(\frac{x}{2}\right)}{\cot\left(\frac{x}{2}\right)-\tan\left(\frac{x}{2}\right)}=\sec\left(x\right)$
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