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b in (-oo:+oo)
55/25 = 14*b // - 14*b
55/25-(14*b) = 0
55/25-14*b = 0
11/5-14*b = 0 // - 11/5
-14*b = -11/5 // : -14
b = -11/5/(-14)
b = 11/70
b = 11/70
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