Another political math "problem" isn't 100 - 4 = 96?

The u. s. senate has 100. We know independent was at least 4, because 4 of the 34 in this recent past election were independent.

If so why do websites say democrats had 50 senate seats?

100-4=96 if republican had 49 and independent at least 4! That leaves only 47 for democrats?

Another political math "problem" isn't 100 - 4 = 96?
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