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B in (-oo:+oo)
B/19 = 12/19 // - 12/19
B/19-(12/19) = 0
B/19-12/19 = 0
1/19*B-12/19 = 0 // + 12/19
1/19*B = 12/19 // : 1/19
B = 12/19/1/19
B = 12
B = 12
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