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D( b )
2*b-10 = 0
2*b-10 = 0
2*b-10 = 0
2*b-10 = 0 // + 10
2*b = 10 // : 2
b = 10/2
b = 5
b in (-oo:5) U (5:+oo)
b/3 = (b-9)/(2*b-10)-(1/2) // - (b-9)/(2*b-10)-(1/2)
b/3-((b-9)/(2*b-10))+1/2 = 0
(-1*(b-9))/(2*b-10)+b/3+1/2 = 0
(-1*2*3*(b-9))/(2*3*(2*b-10))+(2*b*(2*b-10))/(2*3*(2*b-10))+(1*3*(2*b-10))/(2*3*(2*b-10)) = 0
2*b*(2*b-10)-1*2*3*(b-9)+1*3*(2*b-10) = 0
4*b^2-26*b+6*b-30+54 = 0
4*b^2-20*b+24 = 0
4*b^2-20*b+24 = 0
4*(b^2-5*b+6) = 0
b^2-5*b+6 = 0
DELTA = (-5)^2-(1*4*6)
DELTA = 1
DELTA > 0
b = (1^(1/2)+5)/(1*2) or b = (5-1^(1/2))/(1*2)
b = 3 or b = 2
4*(b-2)*(b-3) = 0
(4*(b-2)*(b-3))/(2*3*(2*b-10)) = 0
(4*(b-2)*(b-3))/(2*3*(2*b-10)) = 0 // * 2*3*(2*b-10)
4*(b-2)*(b-3) = 0
( 4 )
4 = 0
b belongs to the empty set
( b-2 )
b-2 = 0 // + 2
b = 2
( b-3 )
b-3 = 0 // + 3
b = 3
b in { 2, 3 }
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