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d in (-oo:+oo)
((5*d)/3)*d-1 = 17/10 // - 17/10
((5*d)/3)*d-(17/10)-1 = 0
((5*d)/3)*d-17/10-1 = 0
5/3*d^2 = 27/10 // : 5/3
d^2 = 81/50
d^2 = 81/50 // ^ 1/2
abs(d) = (81/50)^(1/2)
d = (81/50)^(1/2) or d = -(81/50)^(1/2)
d in { (81/50)^(1/2), -(81/50)^(1/2) }
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