$6x-8x^5$
$\lim_{x\to0}\left(\frac{7}{x}\right)^{4x}$
$6ax-4by-4bx-12a+6ay+8b$
$\left(a\:+\:3\right)\left(a\:+\:1\right)\:-\:4\left(a\:+\:1\right)$
$\frac{4x^2-2x+12}{x+2}$
$-2cd+2cd$
$\sqrt{b}+\sqrt{n}+\sqrt{6m}$
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