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b in (-oo:+oo)
2*b-(4/6) = b-(1/18) // - b-(1/18)
2*b-b-(4/6)+1/18 = 0
2*b-b-2/3+1/18 = 0
b-11/18 = 0 // + 11/18
b = 11/18
b = 11/18
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