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b in (-oo:+oo)
2*b-(1/4) = 5 // - 5
2*b-(1/4)-5 = 0
2*b-1/4-5 = 0
2*b-21/4 = 0 // + 21/4
2*b = 21/4 // : 2
b = 21/4/2
b = 21/8
b = 21/8
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