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b in (-oo:+oo)
373/240 = (5/6)*b-((1/5)*b)+1 // - (5/6)*b-((1/5)*b)+1
(1/5)*b-((5/6)*b)+373/240-1 = 0
(-5/6)*b+(1/5)*b+373/240-1 = 0
133/240-19/30*b = 0 // - 133/240
-19/30*b = -133/240 // : -19/30
b = -133/240/(-19/30)
b = 7/8
b = 7/8
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