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D( b )
b-4 = 0
b-4 = 0
b-4 = 0
b-4 = 0 // + 4
b = 4
b in (-oo:4) U (4:+oo)
b^3-((5*b^2*(8-2*b))/(b-4)) = 0
b^3-5*b^2*(8-2*b)*(b-4)^-1 = 0
(-5*b^2*(8-2*b))/(b-4)+b^3 = 0
(-5*b^2*(8-2*b))/(b-4)+(b^3*(b-4))/(b-4) = 0
b^3*(b-4)-5*b^2*(8-2*b) = 0
b^4+6*b^3-40*b^2 = 0
b^4+6*b^3-40*b^2 = 0
b^2*(b^2+6*b-40) = 0
b^2+6*b-40 = 0
DELTA = 6^2-(-40*1*4)
DELTA = 196
DELTA > 0
b = (196^(1/2)-6)/(1*2) or b = (-196^(1/2)-6)/(1*2)
b = 4 or b = -10
b^2*(b+10)*(b-4) = 0
(b^2*(b+10)*(b-4))/(b-4) = 0
(b^2*(b+10)*(b-4))/(b-4) = 0 // * b-4
b^2*(b+10)*(b-4) = 0
( b+10 )
b+10 = 0 // - 10
b = -10
( b-4 )
b-4 = 0 // + 4
b = 4
( b^2 )
1*b^2 = 0 // : 1
b^2 = 0
b = 0
b in { 4}
b in { -10, 0 }
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