$6m+-8m+-m$
$x^4+16x^2+16$
$\frac{x^2}{9}-1$
$5x-3x^2+1$
$3x^2-3x+1$
$\frac{x^{2\:}+3}{x-2}$
$\lim_{x\to\infty}\left(\sqrt{3x^2-2x+1}-\sqrt{3x^2+5x-3}\right)$
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