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Find the value of the digit $c$ in the following calculation.
$$\begin{align}&ab\\-&ba\\&\overline{c4}\end{align}$$Problem ID: 277 (13 May 2006) Difficulty: 1 Star
Find the value of the digit $c$ in the following calculation.
$$\begin{align}&ab\\-&ba\\&\overline{c4}\end{align}$$
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