d=n(n-3)/2

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Solution for d=n(n-3)/2 equation: 


1.5*(1-x-0.33)+1.46*x-3*0.33 = 0

1.5*(1-x-0.33)+1.47*x-3*0.33 = 0

1.5*(1-x-0.33)+1.48*x-3*0.33 = 0

5;9;1;10;1;4

1.5*(1-x-0.33)+1.49*x-3*0.33 = 0

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