Show that the equation of the circle pas...

Show that the equation of the circle passing through (1, 1) and the points of intersection of the circles `x^2+y^2+13 x-13 y=0` and `2x^2+2y^2+4x-7y-25=0` is `4x^2+4y^2+30 x-13 y-25=0.`

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