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b in (-oo:+oo)
7/8 = b+1/2 // - b+1/2
7/8-b-(1/2) = 0
7/8-b-1/2 = 0
3/8-b = 0 // - 3/8
-b = -3/8 // * -1
b = 3/8
b = 3/8
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