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d in (-oo:+oo)
((d-3)^2)/5 = -0.4 // + 0.4
((d-3)^2)/5+0.4 = 0
((d-3)^2)/5+(0.4*5)/5 = 0
(d-3)^2+0.4*5 = 0
d^2-6*d+11 = 0
d^2-6*d+11 = 0
d^2-6*d+11 = 0
DELTA = (-6)^2-(1*4*11)
DELTA = -8
DELTA < 0
1 = 0
1/5 = 0
1/5 = 0 // * 5
1 = 0
d belongs to the empty set
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