$-\frac{3b^4}{\left(4b^{-2}\right)^{-1}\cdot3b^4}$
$3x-7+2x+1$
$40.950-12.535-8.240-5.360+305$
$\lim_{x\to0}\left(\frac{n+1}{n^2}\right)$
$8\:-\:5\:-\:34\:+\:15\:-\:1$
$-2xy+3xy+xy+3xy-4xy$
$6g+20\:=\:2g+36$
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