$\frac{21x^3+27x^2-18x}{3x}$
$2\left(n+3\right)+n+1$
$4\frac{dy}{dx}+3y=4ysin^2x$
$\left(-18x^4-13x^3+15x^2+7x-6\right)+\left(15x^3+13x^2+10x-7\right)$
$sin2x-cosx=0$
$\frac{r}{7}\ge-6$
$\sin y\:\sec y\:=\:\tan y$
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