$2\left(7-x\right)\le\frac{4x}{3}-\frac{1}{6}$
$9x^2-21x+49$
$-2x^{-3}\cdot4x^7$
$20+s^2-8s$
$\lim_{x\to infinite}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$\left(d+e+f\right)^2$
$\frac{x^3+0-8}{2x^2}$
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