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Let point O be at the point where  ∠POQ = ∠x

∠RQO = 90º – 73º = 17º          ∠RQO same angle as ∠RQO before folding the  rectangle 

∠PQO = 90º – ∠RQO – 17º = 56º

 

∠x = 180º – 56º – 56º = 68º                 triangle OPQ is isosceles

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