$\left(x^2y+4y\right)\frac{dy}{dx}=-x$
$5+\frac{1}{2}x>7$
$n^3-343x^3$
$\sqrt{81a^2b}$
$\lim_{x\to\infty}\left(\frac{1}{x^x}\right)$
$\frac{2-6x}{x^2+1}$
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