$\left(\sqrt{5}+1\right)\left(\sqrt{5}-1\right)+\left(\sqrt{7}-1\right)\left(\sqrt{7}+1\right)$
$20-\left(5\right)-\left(-15\right)$
$\left(-12\right)\left(+7\right)\left(-5\right)$
$\frac{x_{-3}}{2}-\frac{x-2}{8}\le\frac{x}{2}$
$3x^2-6x-9$
$2-1-4-2$
$\lim_{x\to1}\left(\frac{\ln\left(x\right)}{x+1}\right)$
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