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b in (-oo:+oo)
3*b = 1/3 // - 1/3
3*b-(1/3) = 0
3*b-1/3 = 0
3*b-1/3 = 0 // + 1/3
3*b = 1/3 // : 3
b = 1/3/3
b = 1/9
b = 1/9
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