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77
(77 + 155) / 2 = 116
There are many ways to get 77 using simple arithmetic: 33 + 44 = 77, 1 + 76 = 77, 154/2 = 77, 7 x 11 = 77, etc.
(5/11) - (2/7) = (35/77) - (22/77) = 13/77
2+2=22 and 7+7=77 so 22+77=2277!