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b in (-oo:+oo)
(-13.9*b)/12.8 = -13.306 // + 13.306
(-13.9*b)/12.8+13.306 = 0
13.306-1.0859375*b = 0 // - 13.306
-1.0859375*b = -13.306 // : -1.0859375
b = -13.306/(-1.0859375)
b = 12.25300719
b = 12.25300719
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