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b in (-oo:+oo)
2*b-(3/4) = b-(4/12) // - b-(4/12)
2*b-b-(3/4)+4/12 = 0
2*b-b-3/4+4/12 = 0
b-5/12 = 0 // + 5/12
b = 5/12
b = 5/12
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