$-8w+6mw$
$-8x+13-12x+12-x$
$\frac{x-3y}{3}-2y-5$
$\:\left(-3\right)\:^3$
$\sec^230-\tan^245$
$\lim\:_{x\to\:\:5}\left(\frac{x^2-5x+6}{x-5}\right)$
$x^3+5x^2-9x-45$
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