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B in (-oo:+oo)
B/15 = 1/5 // - 1/5
B/15-(1/5) = 0
B/15-1/5 = 0
1/15*B-1/5 = 0 // + 1/5
1/15*B = 1/5 // : 1/15
B = 1/5/1/15
B = 3
B = 3
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