Well, that depends. :) If it really is a fact, then yes... but people sometimes think that things are facts and they really aren't, so people argue about things like that. In the past, people thought it was a fact that the world was flat... but then we found out it wasn't. Scientists, even now, argue over what things are fact and which aren't.
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no it is not always true
It depends on what the fact is.
Tautologies are always true.
They always have the same numbers.
Seems to me like if it's not always true, then it's no equation.