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Answer: Option A
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In ΔAOC and ΔAOB,OC=OB(Given)∠OBC=∠OCA(Both angles are right angles)And AO is common side.Hence, ΔAOC≅ΔAOB(RHS congruence)∴∠CAO=∠BAO(CPCT)⇒2x+24=30⇒x=3⇒x−3=0
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