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p in (-oo:+oo)
6/13 = p/12 // - p/12
6/13-(p/12) = 0
6/13-1/12*p = 0 // - 6/13
-1/12*p = -6/13 // : -1/12
p = -6/13/(-1/12)
p = 72/13
p = 72/13
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