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b in (-oo:+oo)
2*b-(4/6) = b-(2/18) // - b-(2/18)
2*b-b-(4/6)+2/18 = 0
2*b-b-2/3+2/18 = 0
b-5/9 = 0 // + 5/9
b = 5/9
b = 5/9
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