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Because immx = mmviiii. If we place i to both sides of mviiii we have immviiiii which when simplified becomes immx (2010 minus 1). Reverse this procedure to immx and we go back to mmviiii (2009).

If you consider the numbers:

1 2 3 4 5 6 7 8 9 10, in roman numerals

I II III IV V VI VII VIII IX X, respectively

you can see the the number 9 in similar to 4 in that the 'I' is placed before the major number, in these cases 'V' and 'X' for 5 and 10, so the number 9 would be 10 (X) minus 1 (I) so number 9 would be IX.

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