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The line x+2y+3=0 cuts the circle x^2+y^...

The line `x+2y+3=0` cuts the circle `x^2+y^2+4x+4y=1` at P and Q, and the line `2x+3y+lambda=0` cuts the circle `x^2+y^2+6x+2y=7` at R and S. If P, Q, R and S are concyclic then `lambda` is equal to

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