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If the lines ax+y+1=0, x+by+1=0, x+y+c=0...

If the lines ax+y+1=0, x+by+1=0, x+y+c=0, (a, b, c are distinct and not equal to 1), are concurrent, then find the value of `1/(1-a)+1/(1-b)+1/(1-c)`

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