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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
6 = -3/b // + -3/b
6-(-3/b) = 0
3*b^-1+6 = 0
3*b^-1 = -6 // : 3
b^-1 = -2
-1 < 0
1/(b^1) = -2 // * b^1
1 = -2*b^1 // : -2
-1/2 = b^1
b = -1/2
b = -1/2
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