$\left(\frac{2}{3}m-3n\right)^2$
$\frac{2}{x-5}+\frac{3x}{-25+x^2}$
$u^2-14u+14$
$\left(5-2k\right)^2$
$\left(2s+\frac{1}{3}t\right)\left(2s-\frac{1}{3}t\right)$
$\int\frac{3x-2}{2x^2-1}dx$
$\frac{4^{4}}{\left(-2\right)^{2}\cdot4}$
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