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b in (-oo:+oo)
(1/2)*b+(2/3)*b+1/5 = 17/15 // - 17/15
(1/2)*b+(2/3)*b+1/5-(17/15) = 0
(1/2)*b+(2/3)*b+1/5-17/15 = 0
7/6*b-14/15 = 0 // + 14/15
7/6*b = 14/15 // : 7/6
b = 14/15/7/6
b = 4/5
b = 4/5
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