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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
-6 = 18/b // - 18/b
-(18/b)-6 = 0
-18*b^-1-6 = 0
-18*b^-1 = 6 // : -18
b^-1 = -1/3
-1 < 0
1/(b^1) = -1/3 // * b^1
1 = -1/3*b^1 // : -1/3
-3 = b^1
b = -3
b = -3
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