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b in (-oo:+oo)
b/2-b+1/4 = 7/4 // - 7/4
b/2-b+1/4-(7/4) = 0
b/2-b+1/4-7/4 = 0
-1/2*b-3/2 = 0 // + 3/2
-1/2*b = 3/2 // : -1/2
b = 3/2/(-1/2)
b = -3
b = -3
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