$\frac{4}{x+2}-\frac{2}{3x+6}=\frac{5}{12}$
$-1\left(-x\:-3\right)^{2\:}-1$
$2.5x-6=-10.4$
$\frac{\sqrt{2-7x}\left(x^2+5\right)}{x^2+7x+3}$
$0.1^{20}$
$\lim_{x\to infinity}\left(\frac{\sqrt{1+x^2}}{x^2}\right)$
$-2\left(-4\left(+6-2\right)-7\right)$
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