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B in (-oo:+oo)
B/8 = 7.2/14.4 // - 7.2/14.4
B/8-(7.2/14.4) = 0
B/8-0.5 = 0
1/8*B-0.5 = 0 // + 0.5
1/8*B = 0.5 // : 1/8
B = 0.5/1/8
B = 4
B = 4
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