'7' The Absolute middle term.
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x^2-15x+14=0 Delta = (-15)^2-4*1*14 = 169 = 13^2 so x=(15-13)/2=1 or x=(15+13)/2=14
As 13 is a prime number only itself and 1 are multiple. 13x1=13 and 13+1=14.
5/7 + 1/2 = 10/14 + 7/14 = 17/14 = 13/14
14*13/(2*1) = 91 combintions.
Points: (2, 1) and (14, 6) Distance: 13