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b in (-oo:+oo)
47/39 = b/2 // - b/2
47/39-(b/2) = 0
47/39-1/2*b = 0 // - 47/39
-1/2*b = -47/39 // : -1/2
b = -47/39/(-1/2)
b = 94/39
b = 94/39
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