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