$5x^2+7x=2$
$\frac{x}{x^3-1}$
$\left(a-1\right)\left(a-16\right)$
$\frac{15-5x}{3x^2-27}$
$2x^2-2x+2$
$\lim_{x\to\infty}\left(\frac{\sqrt{9x^6-x}}{x^3+3}\right)$
$x^2+8\ge6x$
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