$\left(\frac{2}{3\:x}+y\right)^2$
$\frac{\left(2x^3-8x^2-1\right)}{x-4}$
$\frac{dx}{dt}=-\frac{t^2+x^2}{2tx}$
$-21:\:-2$
$\left(5d-m\right)^2$
$n+9+1+3n$
$4\left(n\:-\:5\right)\:-\:2\left(n\:+\:20\right)\:\le\:1500$
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