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d in (-oo:+oo)
d^2 = 4/29 // - 4/29
d^2-(4/29) = 0
d^2-4/29 = 0
1*d^2 = 4/29 // : 1
d^2 = 4/29
d^2 = 4/29 // ^ 1/2
abs(d) = (4/29)^(1/2)
d = (4/29)^(1/2) or d = -(4/29)^(1/2)
d in { (4/29)^(1/2), -(4/29)^(1/2) }
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