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If a^(3)-3a^(2)+5a-17=0 and b^(3)-3b^(2)...

If `a^(3)-3a^(2)+5a-17=0` and `b^(3)-3b^(2)+5b+11=0` are such that `a+b` is a real number, then the value of `a+b` is

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