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solve [ y1 = a* ( x1-x2 ) ^ 2 + y2 and y3 = a* ( x3-x2 ) ^ 2 + y2 , { x2 , a } ]
solve [ y1 = a* ( x1-x2 ) ^ 2 + y2 and y3 = a* ( x3-x2 ) ^ 2 + y2 , { x2 , a } ]
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