Think Next...

What number comes next in this sequence:
7 8 5 5 3 4 4 _




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Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

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**Hint: It is a Number Series Puzzle

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In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki