$4=\frac{2}{7}x$
$abc-abcx-aby$
$\lim_{x\to\infty}\left(\frac{5-\sqrt{x^2-1}}{5-\sqrt{1+x^2}}\right)$
$3x+1\le x+4$
$\lim_{x\to a}\left(\frac{x^4-3ax^3-2a^4}{x^2-ax}\right)$
$-\left(-30\right)+\left(-50\right)-\left(+20\right)+\left(+10\right)$
$\lim_{x\to\infty}\left(\sqrt{x^2+6x}-x\right)$
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