15=1/2n(n-3)

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Solution for 15=1/2n(n-3) equation:


(1/3)^(-2/5)

((3/4)/2)/3 = (x/8)/9

x^3 = 0

(3-x)*(3-x) = 0

1*x^4+3*x^3-(9*x^2)+3*x-10 = 0

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