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The coefficient.
There is no unknown term.
Four times the unknown number. Let's say the unknown number is x. x + 3x = 4x
I honestly don't know, for it is unknown.
Yes, it is (unknown reasons, unknown consequences). The word known is the past participle of the verb 'to know' and can act as an adjective. Unknown is the antonym (opposite) and means unidentifiable or mysterious.