$\lim_{v\to\infty}\left(\frac{-y^z}{3x^2-7y^3+2z-3}\right)$
$\int\:\frac{e^x}{\sqrt{e^{2x}+e^x+1}}dx$
$5a-\left[-3b-\left(2a+4b-c\right)+4c\right]$
$2<-8-u$
$\frac{\left(7x^2\right)^3-\left(9y\right)^3}{7x^2-9y}$
$\frac{4x+6}{2x+3}$
$1x^3+15x$
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