$\frac{8x^3-10x^2+5x+4}{2x-1}$
$-6x+7\le2+13x$
$\frac{x^3+8}{x^2+4}$
$81^{2-3x}=3^{-8x}$
$x+12x+35$
$2x^2=8$
$x^3\sqrt{x}^4-1$
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