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B in (-oo:+oo)
B/13 = 3/13 // - 3/13
B/13-(3/13) = 0
B/13-3/13 = 0
1/13*B-3/13 = 0 // + 3/13
1/13*B = 3/13 // : 1/13
B = 3/13/1/13
B = 3
B = 3
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