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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
5/b-7 = 93 // - 93
5/b-93-7 = 0
5*b^-1 = 100 // : 5
b^-1 = 20
-1 < 0
1/(b^1) = 20 // * b^1
1 = 20*b^1 // : 20
1/20 = b^1
b = 1/20
b = 1/20
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