$-\:3\:-\:\:\left(-5\right)\left(4\right)\:+\:18\::\:\left(\:-\:3\right)\:-\:\left(-14\:+\:21\right)$
$\frac{2}{n}\left(6\right)$
$\frac{d}{dx}x^{\frac{2}{3}}-x^{\frac{1}{3}}+4$
$\frac{a^{-7}}{a^{2b}}$
$2^2-2\cdot2\cdot3+4$
$4x-2y-11y-7x-3$
$\left(5x-7\right)\left(5x-7\right)^2$
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