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B in (-oo:+oo)
B/12 = 0.25 // - 0.25
B/12-0.25 = 0
1/12*B-0.25 = 0 // + 0.25
1/12*B = 0.25 // : 1/12
B = 0.25/1/12
B = 3.00000012
B = 3.00000012
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