$x^2+7x>0$
$5.3333333-\left(0.1\right)^{-1}+0.6666-\sqrt[3]{-0.125}$
$\lim\:_{x\to\:\:-\infty\:}\left(\frac{x}{\:\sqrt{x^2+5x+1}}\right)$
$\left(4p-5\right)^3$
$30d^2-60df+25f^2$
$16x^2-196y^2$
$\left(x^n-6\right)\left(x^n+6\right)$
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