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R-(-1) by x*y=x+y+xy for x, y as element of R
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R-(-1) by x*y=x+y+xy for x, y as element of R

User Narek Mamikonyan
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Explanation:

here is a solution :

R-(-1) by x*y=x+y+xy for x, y as element of R-example-1
User Zaynab
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