2xx−3,x≠3
2xx+3,x≠−3
3xx−3,x≠3
3xx+3,x≠−3
Correct answer is A
From the rules of binary operation, x∗e=x
⟹x∗e=3x+3e−xe=x
3e−xe=x−3x=−2x
e=2xx−3,x≠3
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