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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
1.6/2.4 = 3.4/b // - 3.4/b
1.6/2.4-(3.4/b) = 0
1.6/2.4-3.4*b^-1 = 0
-3.4*b^-1 = -0.66666667 // : -3.4
b^-1 = 0.19607843
-1 < 0
1/(b^1) = 0.19607843 // * b^1
1 = 0.19607843*b^1 // : 0.19607843
5.10000004 = b^1
b = 5.10000004
b = 5.10000004
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