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b in (-oo:+oo)
2*b+3/4 = 1/2 // - 1/2
2*b+3/4-(1/2) = 0
2*b+3/4-1/2 = 0
2*b+1/4 = 0 // - 1/4
2*b = -1/4 // : 2
b = -1/4/2
b = -1/8
b = -1/8
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