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