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D( b )
3*b = 0
3*b = 0
3*b = 0
3*b = 0 // : 3
b = 0
b in (-oo:0) U (0:+oo)
-3/(3*b) = -2 // + 2
2-3/(3*b) = 0
-1*b^-1 = -2 // : -1
b^-1 = 2
-1 < 0
1/(b^1) = 2 // * b^1
1 = 2*b^1 // : 2
1/2 = b^1
b = 1/2
b = 1/2
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