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7777 - MMMMMMMDCCLXXVII
If 11 + X = 77, X = 66. What you have to do is 77 - 66, and that = 11!
7777 + 777*4 + 7*22 + 77 - 7 + 2 = 11111
830 x 77 = 63,910
7x10=77 7 x 11 = 77