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B in (-oo:+oo)
B/4 = 9.78 // - 9.78
B/4-9.78 = 0
1/4*B-9.78 = 0 // + 9.78
1/4*B = 9.78 // : 1/4
B = 9.78/1/4
B = 39.12
B = 39.12
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