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If the binary operation * on the set Z of integers is defined by `a\ *\ b=a+b\ -\ 5` , then write the identity element for the operation * in Z.

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here, `a**b= a+b-5`
`a**b= b**a=a`
`a**b=a`
`cancel(a)+b-5= cancel(a)`
`b=5`
`b**a= b+a-5=a`
`b+a-5=a`
`b=5`
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