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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
96/b = 48/51 // - 48/51
96/b-(48/51) = 0
96/b-16/17 = 0
96*b^-1 = 16/17 // : 96
b^-1 = 1/102
-1 < 0
1/(b^1) = 1/102 // * b^1
1 = 1/102*b^1 // : 1/102
102 = b^1
b = 102
b = 102
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