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b in (-oo:+oo)
3/8 = 5/12-((1/5)*b) // - 5/12-((1/5)*b)
(1/5)*b+3/8-(5/12) = 0
(1/5)*b+3/8-5/12 = 0
1/5*b-1/24 = 0 // + 1/24
1/5*b = 1/24 // : 1/5
b = 1/24/1/5
b = 5/24
b = 5/24
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