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From previous, PQ = [[2a,0],[6a+1,b]]. P-Q = [[2-a,0],[6-1,1-b]] = [[2-a,0],[5,1-b]]. Equate: 2a = 2-a → 3a=2 → a=2/3. 0=0. 6a+1=5 → 6a=4 → a=2/3 consistent. b=1-b → 2b=1 → b=0.5.
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