5. Express in algebraic expression

In a \(3 \times 3\) magic square, a row contains \(2a\), \(b\), \(a + c\). If the magic sum is 30, express \(c\) in terms of \(a\) and \(b\).
 
Ans: 
 
\(c = \)
 
[Note: Enter the symbols \(+\), \(-\), or \(=\) wherever necessary]
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