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b in (-oo:+oo)
(4*b)/6 = b^2 // - b^2
(4*b)/6-b^2 = 0
2/3*b-b^2 = 0
DELTA = (2/3)^2-(-1*0*4)
DELTA = 4/9
DELTA > 0
b = ((4/9)^(1/2)-2/3)/(-1*2) or b = (-(4/9)^(1/2)-2/3)/(-1*2)
b = 0 or b = 2/3
b in { 0, 2/3 }
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