$\frac{k}{5}+2.5=0.5$
$72+3x=3$
$36m^2-81=0$
$\left(1+x^2\right)\left(3m-2n\right)$
$\frac{d}{dx}\sqrt{\frac{x-5}{x^4+3}}$
$-\:9\:-\:35\:+\:22\:-\:9\:+\:8\:-\:11$
$10+\:-9\:+\:\frac{-90}{5}$
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