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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
-16/b = 4 // - 4
-16/b-4 = 0
-16*b^-1 = 4 // : -16
b^-1 = -1/4
-1 < 0
1/(b^1) = -1/4 // * b^1
1 = -1/4*b^1 // : -1/4
-4 = b^1
b = -4
b = -4
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