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Factual information can be stated clearly and unambiguously , either true or false will the the answer for it, if you question it.  Facts are written or presented on the basis of logical and mathematical deductions.  Hence they cannot be presented with bias.  That is why they are called facts.

Opinions can be presented with bias.  If you think a fact is having a bias, it means it is not a fact, but an opinion.

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