$\frac{a^3-27b^3}{a-9b}$
$\frac{d}{dx}x^2+y^2-2x-4y=0$
$\lim_{x\to-1}\left(\frac{4x^4+2x^3+6x+4}{x+1}\right)$
$5x-7>3x+2$
$n^2+6n+1$
$\lim_{x\to1}\left(e^{3x}-1\right)$
$\left(x^5:x\right)\cdot x^2$
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