n(n-1)/2=105 - solution

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Solution for n(n-1)/2=105 equation:

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x^3*((6*x^4-(9*x^2))/3)

9/10-4.5 = 0

100/x = 58

(4*n)/11 = 6/7

(2^3*2^3)/((2^-1)^3) = 0

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