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B in (-oo:+oo)
B/86 = 79/86 // - 79/86
B/86-(79/86) = 0
B/86-79/86 = 0
1/86*B-79/86 = 0 // + 79/86
1/86*B = 79/86 // : 1/86
B = 79/86/1/86
B = 79
B = 79
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