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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
-3/b = 1.5 // - 1.5
-3/b-1.5 = 0
-3*b^-1 = 1.5 // : -3
b^-1 = -0.5
-1 < 0
1/(b^1) = -0.5 // * b^1
1 = -0.5*b^1 // : -0.5
-2 = b^1
b = -2
b = -2
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