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d in (-oo:+oo)
4*d-(((8*d)/12)*d)-6 = 0
(-2/3)*d^2+4*d-6 = 0
4*d-2/3*d^2-6 = 0
DELTA = 4^2-(-6*(-2/3)*4)
DELTA = 0
d = -4/(-2/3*2)
d = 3 or d = 3
d in { 3, 3 }
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