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Triangle ABC is formed by the lines 7x-...

Triangle ABC is formed by the lines `7x-y + 3 = 0, x + y-3=0 and x-3y-31 = 0,` Three new lines are drawn parallel to `BC, CA, AB` passing through `A, B and C` intersecting each other at P, Q and R respectively the circum centre of `DeltaPQR` lies on

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