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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
10/b = 60/12 // - 60/12
10/b-(60/12) = 0
10/b-5 = 0
10*b^-1 = 5 // : 10
b^-1 = 1/2
-1 < 0
1/(b^1) = 1/2 // * b^1
1 = 1/2*b^1 // : 1/2
2 = b^1
b = 2
b = 2
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