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b in (-oo:+oo)
(4/5)/7 = b-((3/1)/2) // - b-((3/1)/2)
(4/5)/7-b+(3/1)/2 = 0
(4/5)/7-b+3/2 = 0
113/70-b = 0 // - 113/70
-b = -113/70 // * -1
b = 113/70
b = 113/70
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