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