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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
35/b = 7 // - 7
35/b-7 = 0
35*b^-1 = 7 // : 35
b^-1 = 1/5
-1 < 0
1/(b^1) = 1/5 // * b^1
1 = 1/5*b^1 // : 1/5
5 = b^1
b = 5
b = 5
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