$3x^2+4y\frac{dy}{dx}=7$
$4-2x>x^2+1$
$2x+2\ge-3x+22$
$7^{2}-3^{4}+5^{2}-1^{8}$
$3n^{-3}\:x\:4n$
$27x+3$
$\lim_{x\to\infty}\left(\frac{x^2+1}{x^2-3}\right)$
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