$19+n=30$
$a^4+2a^2\:b^2+b^4\:$
$\left(4x-20y+3z\right)^2$
$\frac{4x+17}{4}>25\:\frac{x+11}{7}$
$\frac{d^2}{dx^2}\left(y+\sqrt{3x^2+1}\right)$
$\frac{dy}{dx}+\frac{y}{x}=e^{-x}$
$196+13x+x^2$
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