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If the circles x^2+y^2+2a x+c y+a=0 and...

If the circles `x^2+y^2+2a x+c y+a=0` and `x^2+y^2-3a x+d y-1=0` intersects at points P and Q , then find the values of `a` for which the line `5x+b y-a=0` passes through `Pa n dQdot`

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