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