$3x<20+x$
$\int7x^{-3}dx$
$\lim_{x\to-1}\left(\frac{5x^2+9}{2tanx-3x^3}\right)$
$\sqrt{25x^2y^4}$
$x^2+x\:=\:42$
$-5\left(7y+6\right)+5\le-8\left(8-4y\right)$
$x^2+4<0$
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