Suppose that \(4^{x_1}=5\), \(5^{x_2}=6\), \(6^{x_3}=7\), ... , \(127^{x_{124}}=128\). The original answer is in the form \(\frac{k}{m}\), where \(k\) and \(m\) are integers. Please find the value of \(k + m\).

Let's think step by step and output the final answer within \boxed{}.
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