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B in (-oo:+oo)
B/15 = 0.8 // - 0.8
B/15-0.8 = 0
1/15*B-0.8 = 0 // + 0.8
1/15*B = 0.8 // : 1/15
B = 0.8/1/15
B = 11.9999994
B = 11.9999994
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