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p in (-oo:+oo)
8.1/27 = p/5 // - p/5
8.1/27-(p/5) = 0
0.3-1/5*p = 0 // - 0.3
-1/5*p = -0.3 // : -1/5
p = -0.3/(-1/5)
p = 1.5
p = 1.5
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