Andrew was playing with a line having the equation: \(ax+by+c=0\) . He reflected a certain point having co-ordinates \((m,n)\) on that line and found that the co-ordinates of the new point were \((n,m)\).

Andrew was intrigued by this and challenged his friends to find the value of \(a+b\) .So, what is the value of \(a+b\)?

**Clarification:** The point \((m,n)\) does not lie on Andrew's line.

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