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D( b )
b^2+4*b+4 = 0
b+2 = 0
b^2+4*b+4 = 0
b^2+4*b+4 = 0
b^2+4*b+4 = 0
DELTA = 4^2-(1*4*4)
DELTA = 0
b = -4/(1*2)
b = -2 or b = -2
b+2 = 0
b+2 = 0
b+2 = 0 // - 2
b = -2
b in (-oo:-2) U (-2:+oo)
9/(b^2+4*b+4)+2/3 = b/(b+2) // - b/(b+2)
9/(b^2+4*b+4)-(b/(b+2))+2/3 = 0
9/(b^2+4*b+4)+(-1*b)/(b+2)+2/3 = 0
b^2+4*b+4 = 0
b^2+4*b+4 = 0
b^2+4*b+4 = 0
DELTA = 4^2-(1*4*4)
DELTA = 0
b = -4/(1*2)
b = -2 or b = -2
(b+2)^2 = 0
9/((b+2)^2)+(-1*b)/(b+2)+2/3 = 0
(3*9)/(3*(b+2)^2)+(-1*3*b*(b+2))/(3*(b+2)^2)+(2*(b+2)^2)/(3*(b+2)^2) = 0
2*(b+2)^2-1*3*b*(b+2)+3*9 = 0
2*b^2-3*b^2-6*b+8*b+8+27 = 0
2*b-b^2+35 = 0
2*b-b^2+35 = 0
2*b-b^2+35 = 0
DELTA = 2^2-(-1*4*35)
DELTA = 144
DELTA > 0
b = (144^(1/2)-2)/(-1*2) or b = (-144^(1/2)-2)/(-1*2)
b = -5 or b = 7
(b+5)*(b-7) = 0
((b+5)*(b-7))/(3*(b+2)^2) = 0
((b+5)*(b-7))/(3*(b+2)^2) = 0 // * 3*(b+2)^2
(b+5)*(b-7) = 0
( b+5 )
b+5 = 0 // - 5
b = -5
( b-7 )
b-7 = 0 // + 7
b = 7
b in { -5, 7 }
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