$\frac{5-z}{z}=2z$
$\frac{dy}{dt}=7y-280$
$\int\frac{30x}{\left(x+1\right)\left(x+3\right)^2}dx$
$xdx=x^2dv$
$30x^5-30x^4$
$\:\left(2m\:-\:3n\right)^7\:\:\:\:\:\:\:$
$\frac{dy}{dx}=\frac{1}{3}\left(10-y\right)$
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