已知圆A:x^2+y^2+10x=24=0,圆B:x^2+y^2-10x+9=0,若动圆M与圆A、圆B都相切,求动圆圆心M的轨迹方程.(分类讨论)圆A:x^2+y^2+10x+24=0,上面打错了

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