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Let $a$ and $b$ be integers with $a>b>0$ and $\cfrac{{a}^{2}-{b}^{2}}{\left(a-b\right)^{2}}=\cfrac{73}{3}$.

What is the simplest form of $\cfrac{b}{a}$?

$\cfrac{73}{3}$

$\cfrac{38}{35}$

$\cfrac{35}{38}$

$\cfrac{23}{73}$

$\cfrac{73}{23}$