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Anonymous
XVXVX
Another answer:
400 in Roman numerals is CD (-100+500 = 400) but 100-1400=400 still because the numeral ups one after subtraction so actually(-100+500 = 400) doesn't exist
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400 = CCCC or CD
lenpollock ∙
CD is the Roman numeral for 400.
CD
400 = CD
497 = 400 + 90 + 7 = CDXCVII