$x^2+9x=4$
$\frac{d}{dx}\left(ln\frac{x\left(x^2+2\right)}{\sqrt{x^3-7}}\right)$
$x+2y-3z=1$
$\int\:\frac{3sin^3x}{cos\left(x\right)}dx$
$\frac{dy}{dx}=\frac{5\cdot x^4}{18\cdot y^5}$
$\lim_{x\to0}\left(\frac{-1}{x\left(x+2h\right)}\right)$
$x^6-3x$
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