$\left(5m+6n\right)^2-\left(5m-6n\right)^2$
$78x+6-2$
$\frac{2}{x^2-9}-\frac{7x^2}{x-3}+3$
$\frac{m^{10}n^7}{m^1n^6}$
$\left(-6\right)\cdot8-12$
$\lim_{x\to64}\left(\frac{x-64}{\sqrt[3]{x}-4}\right)\:$
$\frac{x^4-x^3\:+x^2\:-x+2\:\:}{x-2}$
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