A circle x ^(2) + y^(2) + 2gx + 2fy + c=...

A circle `x ^(2) + y^(2) + 2gx + 2fy + c=0` passing through`(4,-2) ` is concentric to the circle `x ^(2) + y ^(2) -2x + 4y + 20 =0,` then the value of c will be

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