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b in (-oo:+oo)
2*b-(4/2) = b-(5/6) // - b-(5/6)
2*b-b-(4/2)+5/6 = 0
2*b-b+5/6-2 = 0
b-7/6 = 0 // + 7/6
b = 7/6
b = 7/6
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