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d in (-oo:+oo)
(3/2)*d^2+(4/3)*d = 0
3/2*d^2+4/3*d = 0
DELTA = (4/3)^2-(0*3/2*4)
DELTA = 16/9
DELTA > 0
d = ((16/9)^(1/2)-4/3)/(3/2*2) or d = (-(16/9)^(1/2)-4/3)/(3/2*2)
d = 0 or d = -8/9
d in { -8/9, 0 }
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