$\left(12-5\cdot2\right)$
$24a\:-\:\left(-\:36a\right)$
$\frac{d}{dx}\left(x^4\left(2.8\right)^x\right)$
$m^2+6m=7$
$\int\frac{\cos\theta}{1+\cos\theta}d\theta$
$\left(5a^9b^{10}-7b^5\right)$
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