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