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B in (-oo:+oo)
B/2 = 7/14 // - 7/14
B/2-(7/14) = 0
B/2-1/2 = 0
1/2*B-1/2 = 0 // + 1/2
1/2*B = 1/2 // : 1/2
B = 1/2/1/2
B = 1
B = 1
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