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D( b )
b^2-24 = 0
b^2-24 = 0
b^2-24 = 0
1*b^2 = 24 // : 1
b^2 = 24
b^2 = 24 // ^ 1/2
abs(b) = 2*6^(1/2)
b = 2*6^(1/2) or b = -(2*6^(1/2))
b in (-oo:-(2*6^(1/2))) U (-(2*6^(1/2)):2*6^(1/2)) U (2*6^(1/2):+oo)
(2*b-(4*b^2))/(b^2-24) = 0
(2*b-4*b^2)/(b^2-24) = 0
2*b-4*b^2 = 0
2*b*(1-2*b) = 0
1-2*b = 0 // - 1
-2*b = -1 // : -2
b = -1/(-2)
b = 1/2
2*b*(b-1/2) = 0
(2*b*(b-1/2))/(b^2-24) = 0
( 2*b )
2*b = 0 // : 2
b = 0
( b-1/2 )
b-1/2 = 0 // + 1/2
b = 1/2
b in { 0, 1/2 }
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