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p in (-oo:+oo)
13*p = 8/9 // - 8/9
13*p-(8/9) = 0
13*p-8/9 = 0
13*p-8/9 = 0 // + 8/9
13*p = 8/9 // : 13
p = 8/9/13
p = 8/117
p = 8/117
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