$\frac{x^3-9x}{x^3+3x^2}$
$\lim_{x\to4}2$
$-6m^2+4mn$
$-\frac{70}{35}$
$\frac{-11^{12}}{-11^8}$
$-2-x\le\frac{1}{2}$
$a.\:30\:-\:20\::\:5\:+\:15$
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