$\lim_{x\to5}\frac{x^2-x-20}{x^2-7x+10}$
$x-3<3x+6$
$\frac{d}{dx}\:x^{2\:}-\:2xy\:+\:y^{2\:}+\:4x\:-8y\:+\:16=0$
$6-2x<14$
$\left(c-6\right)\left(c-7\right)$
$\lim_{x\to\infty}\left(5\sqrt{x}\right)$
$\frac{3}{2}x+4<=10$
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