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B in (-oo:+oo)
B/2.78 = 9 // - 9
B/2.78-9 = 0
0.35971223*B-9 = 0 // + 9
0.35971223*B = 9 // : 0.35971223
B = 9/0.35971223
B = 25.02000002
B = 25.02000002
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