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Prove: If D = Q\{3}. R = Q\{-3}, and f:D-> R is defined by f(x) =...

Prove: If D = Q\{3}. R = Q\{-3}, and f:D-> R is defined by f(x) = 1+3x/3-x for all x in D, then f is one-to-one and onto.

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