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p in (-oo:+oo)
12/5 = p/18 // - p/18
12/5-(p/18) = 0
12/5-1/18*p = 0 // - 12/5
-1/18*p = -12/5 // : -1/18
p = -12/5/(-1/18)
p = 216/5
p = 216/5
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