$\left(5x-4\right)^2-\left(x+7\right)^2$
$\left(a^3-5a^2b-8ab^2\right)\left(-4a^4m^2\right)$
$\lim_{x\to0}\left(\frac{x^2}{x+2}\right)$
$\lim_{x\to3}\left(\frac{\sqrt[3]{2x+2}-2}{\sqrt{x}-\sqrt{3}}\right)$
$11abc-8bc+10abc-10bc$
$\left(\frac{2x}{3\left(2x-3\right)}\right)$
$\left(-\frac{4d}{c^3}\right)^{-3}$
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