$-a+b+2b-2c-3a+2c-3b$
$\frac{dy}{dx}\left(5x^4y\right)$
$8a^5+\:125a^2$
$6+5-6^2$
$\left(5a-7\right)x\left(5a+7\right)$
$\lim_{x\to0}\left(\frac{6-6\cos\left(x\right)}{x^2}\right)$
$\frac{4}{7}m^4\cdot8$
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