$\left(-10\right)+\left(2-4\right)\left(-1\right)$
$15x-2<18+5x$
$=\frac{2\left(-7\right)^2+3\left(-7\right)-27}{\left(-7\right)-3}$
$\frac{121-n^2}{121+n}$
$3x+2x-x+2x^2$
$\lim_{x\to-3}\left(\frac{x^3+27}{x^2+4x-21}\right)$
$cos\left(\frac{14}{3}\pi\right)$
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