$\frac{a^3-27b^3}{a-9b}$
$\frac{2-5x}{2}\ge x-1$
$2x^3-15x^2+31x-12$
$134.38\left(40\right)$
$\left(x+5y^3\right)^4$
$5\::\:-5$
$\lim_{x\to5}\left(\frac{sin5x}{tan8x}\right)$
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