$\left(4d-7\right)\left(4d+7\right)$
$2x^3-55x^2+300x$
$\left(x^{3}y^{3}\right)^{-2}\cdot\left(\frac{x}{y^{2}}\right)^{3}$
$95^1$
$\lim_{t\to0}\left(\frac{t^2+2t}{t^2-2t}\right)$
$\frac{m^8-256}{m^2-4}$
$a^2-b^2=36$
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