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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
7/b = 10/100 // - 10/100
7/b-(10/100) = 0
7/b-1/10 = 0
7*b^-1 = 1/10 // : 7
b^-1 = 1/70
-1 < 0
1/(b^1) = 1/70 // * b^1
1 = 1/70*b^1 // : 1/70
70 = b^1
b = 70
b = 70
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