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B in (-oo:+oo)
B/78 = 10/12 // - 10/12
B/78-(10/12) = 0
B/78-5/6 = 0
1/78*B-5/6 = 0 // + 5/6
1/78*B = 5/6 // : 1/78
B = 5/6/1/78
B = 65
B = 65
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