Ten and four elevenths.
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-9 - 11 = -20
11/6 minus 2/9 is 1 11/18
No eleven is not IX, it would be XI. The lower symbol in front of a larger one means to subtract, in this case it is nine (9).
11 + (n/2) = 77 Subtract 11 from both sides: n/2 = 66 Multiply both sides by 2: n = 132
It is 11,12,111