# A number theory problem by Alejandro Castillo

$\large \dfrac1m + \dfrac1n - \dfrac1{mn^2} = \dfrac34$

Let all the solutions of the pairs of integers $$(m,n)$$ that satisfy the equation above be denoted by $$(m_1, n_1), (m_2, n_2), \ldots, (m_k, n_k )$$. Find $$\displaystyle \sum_{i=1}^k (m_i + n_i)$$.

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