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D( b )
12*b^-108 = 0
b = 0
12*b^-108 = 0
12*b^-108 = 0
12*b^-108 = 0 // : 12
b^-108 = 0
b naleu017Cy do O
b = 0
b = 0
b in (-oo:0) U (0:+oo)
(((4*b^2-16)*(36*b+108))/(12*b^-108))*(3*b-6) = 0
((4*b^2-16)*(36*b+108)*(3*b-6))/(12*b^-108) = 0
( 3*b-6 )
3*b-6 = 0 // + 6
3*b = 6 // : 3
b = 6/3
b = 2
( 36*b+108 )
36*b+108 = 0 // - 108
36*b = -108 // : 36
b = -108/36
b = -3
( 4*b^2-16 )
4*b^2 = 16 // : 4
b^2 = 4
b^2 = 4 // ^ 1/2
abs(b) = 2
b = 2 or b = -2
b in { 2, -3, 2, -2 }
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