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d in (-oo:+oo)
((d-3)^2)/5 = 30*d // - 30*d
((d-3)^2)/5-(30*d) = 0
((d-3)^2)/5-30*d = 0
((d-3)^2)/5+(-30*5*d)/5 = 0
(d-3)^2-30*5*d = 0
d^2-156*d+9 = 0
d^2-156*d+9 = 0
d^2-156*d+9 = 0
DELTA = (-156)^2-(1*4*9)
DELTA = 24300
DELTA > 0
d = (24300^(1/2)+156)/(1*2) or d = (156-24300^(1/2))/(1*2)
d = (90*3^(1/2)+156)/2 or d = (156-90*3^(1/2))/2
(d-((156-90*3^(1/2))/2))*(d-((90*3^(1/2)+156)/2)) = 0
((d-((156-90*3^(1/2))/2))*(d-((90*3^(1/2)+156)/2)))/5 = 0
((d-((156-90*3^(1/2))/2))*(d-((90*3^(1/2)+156)/2)))/5 = 0 // * 5
(d-((156-90*3^(1/2))/2))*(d-((90*3^(1/2)+156)/2)) = 0
( d-((156-90*3^(1/2))/2) )
d-((156-90*3^(1/2))/2) = 0 // + (156-90*3^(1/2))/2
d = (156-90*3^(1/2))/2
( d-((90*3^(1/2)+156)/2) )
d-((90*3^(1/2)+156)/2) = 0 // + (90*3^(1/2)+156)/2
d = (90*3^(1/2)+156)/2
d in { (156-90*3^(1/2))/2, (90*3^(1/2)+156)/2 }
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