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