The fives (V=5, L=50, D=500) are never subtracted in Roman numerals, because, for example, VX for 5 (10-5=5) is the same value as just plain V.
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It looks like the letter N which is the symbol for nought and nothing can't be subtracted from anything because it remains the same.
c - cc = -c
DXXXVIII in Roman numerals is equivalent to 538. In Roman numerals, D represents 500, X represents 10, and V represents 5. The smaller numerals are added to the right of the larger numerals, except in cases where a smaller numeral appears before a larger one, in which case it is subtracted.
94. XC is 10 subtracted from 100, aka 90. and IV is one subtracted from 5 aka 4. 90+4=94
The Roman numeral XXXIX represents the number 39. X (10) is subtracted from L (50) in order to express the number 40, and then I (1) is subtracted from 40 to represent 39.