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If the binary operation * on the set Z is defined by a*b`=a+b-5,` then find the identity element with respect to *.

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यदि सेट जेड पर बाइनरी ऑपरेशन * को * बी द्वारा परिभाषित किया गया है `=a+b-5,` फिर * के संबंध में पहचान तत्व पाएं।

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