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