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B in (-oo:+oo)
B/4 = 15.5 // - 15.5
B/4-15.5 = 0
1/4*B-15.5 = 0 // + 15.5
1/4*B = 15.5 // : 1/4
B = 15.5/1/4
B = 62
B = 62
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