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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
4/b = 10/3 // - 10/3
4/b-(10/3) = 0
4/b-10/3 = 0
4*b^-1 = 10/3 // : 4
b^-1 = 5/6
-1 < 0
1/(b^1) = 5/6 // * b^1
1 = 5/6*b^1 // : 5/6
6/5 = b^1
b = 6/5
b = 6/5
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