$y^5+4y^3=0$
$\lim_{x\to6}\left(\frac{x^2-12x+36}{\sin^2\left(\pi x\right)}\right)$
$-12+x=-3$
$\cot^2x+\cot x-2=0$
$a-2b=8$
$n^3+216$
$2x-7\le1$
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