$\frac{9x\:}{2}-6\le\:\frac{11x}{3}\:+45$
$x^2+x=20$
$\lim_{x\to2}\left(\frac{x^2-2x-8}{x^2-4}\right)$
$x^2+30x+200$
$2x^3\cdot4x^{-5}$
$\left(x^{\frac{5}{3}}+x^{-\frac{5}{3}}\right)^3$
$81w^2-18w-1$
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