$-3\:-1\:-5\:+\:15\:-12$
$\frac{\left(-y-8\right)}{x}$
$\lim_{x\to-2}\left(12x^3-13\right)$
$9a-5-5$
$5-2\left(3x+1\right)+x-1$
$cos^{\left(2\right)}x-cosx=0$
$a^2-ab=a$
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