$\left(x\:\cdot7\right)\left(x+7\right)$
$\frac{2x^2+4}{x^2-4}$
$\int-\frac{5}{6}x+\frac{25}{6}+\frac{1}{6}x^2+\frac{5}{6}xdx$
$\frac{2x-4}{x^2-4x+3}$
$\left(\frac{8}{5}x^4+\frac{5}{11}\right)\left(\frac{8}{5}x^4+\frac{2}{31}\right)$
$6x^2+x+5$
$2-\frac{3}{x}-\frac{4}{x^2}$
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