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d in (-oo:+oo)
8 = (d^2)/3-1 // - (d^2)/3-1
1-((d^2)/3)+8 = 0
-1/3*d^2 = -9 // : -1/3
d^2 = 27
d^2 = 27 // ^ 1/2
abs(d) = 3*3^(1/2)
d = 3*3^(1/2) or d = -(3*3^(1/2))
d in { 3*3^(1/2), -(3*3^(1/2)) }
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