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