$\frac{3}{5}=\frac{x}{20}$
$\log_{16}\left(17-5n\right)=\frac{1}{4}$
$\lim_{x\to0}\left(\frac{3x+\sin\left(x\right)}{x}\right)$
$198-\left(-47\right)-\left(-5\right)$
$\:\left(\:pq\:+\:2\:\right)\:\left(\:pq\:-\:2\:\right)\:$
$1+14x^2\:y+49x^4+-1$
$3-4x=55$
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