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It is simply: 11 plus 3/7 of the number
3*(n - 5) = 2*n + 11
The number 8 is halfway between 5 and 11. It is 3 more than 5 and 3 less than 11. To find a halfway point (which is also the average), add the numbers together and divide by 2.
3
1/(any number more than 0.5) 2/(any number more than 1) 3/(any number more than 1.5) 4/(any number more than 2) 5/(any number more than 2.5) 6/(any number more than 3) . . etc.