xxv - iv = xxi
25 - 4 = 21
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In today's terms it is: (XXV)IV or XXVIV but with an horizontal line above each of the first three numerals XXV to indicate multiplication by a thousand. Numerals inside brackets also indicate multiplication by a thousand. So: (XXV)IV = 25*1000+4 = 25004.
It is: XXV-IV-MMXII
XXV-IV-MMV
XXV-IV-MMIV