$\frac{k-3}{2}=\frac{2k+4}{5}$
$\lim_{x\to0}\left(\frac{x^2}{cosx-1}\right)$
$3u+4=-17$
$82.3-4.63$
$w^6-27$
$5k-2=-77$
$\left(x\cdot\frac{dy}{dx}\right)=c$
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