It is known that the domain of the function y = LG (4-x) is a, and the set B = {x | x ﹤ a}, if P: X ﹤ 8364; a is a sufficient and unnecessary domain of Q: X ﹤ 8364; B Find the value range of a
The domain of y = LG (4-x) is 4-x > 0, that is, X
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