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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
17/b = 85/50 // - 85/50
17/b-(85/50) = 0
17/b-17/10 = 0
17*b^-1 = 17/10 // : 17
b^-1 = 1/10
-1 < 0
1/(b^1) = 1/10 // * b^1
1 = 1/10*b^1 // : 1/10
10 = b^1
b = 10
b = 10
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