$\lim_{x\to4}\frac{x^2-2x-8}{x+4}$
$339,294+68,3$
$\left(4x^2+5y\right)\left(4x^2-2\right)$
$\sqrt[4]{x^3\sqrt{x}}$
$\left(\frac{3}{4}a-\frac{4}{3}b\right)\left(\frac{3}{4}a+\frac{4}{3}b\right)$
$3-4-4-7-2-4-5+15$
$2x\:-1\:\le\:-3$
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