$-17-1+18+6+4+4$
$\frac{4}{5x+20}-\frac{1}{3x-12}$
$\left(4+a^6\right)-a^6-3$
$-23d+81\le-98d+82$
$2x-6=4$
$96:\left(-8\right)$
$\lim_{x\to\frac{3}{2}}\left(\frac{\tan\left(5x\right)}{\tan\left(3x\right)}\right)$
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