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If the image of the point P(a, 2, a) in the line \dfracx2 = \dfracy + a1 = \dfracz1 is Q and the image of Q in the line \dfracx - 2b2 = \dfracy - a1 = \dfracz + 2b-5 is P, then a + b is equal to ______. | Watch the step-by-step video solution for this NIMCET PYQ.