$4x^my\left(-\frac{3}{4}+\frac{2}{5}\right)$
$7\sec x-7\cos x$
$x^2+x-5=0$
$3x+8\le x+20$
$\lim_{x\to0}\left(\frac{-2\sin\left(5x^5\right)}{3x}\right)$
$\left(35x^2\right):\left(-5x^2\right)$
$\frac{1}{1+2x}\ge-0.1$
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