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b in (-oo:+oo)
2*b-(4/4) = b-(5/2) // - b-(5/2)
2*b-b-(4/4)+5/2 = 0
2*b-b+5/2-1 = 0
b+3/2 = 0 // - 3/2
b = -3/2
b = -3/2
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