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p in (-oo:+oo)
0.45/4.2 = p/15 // - p/15
0.45/4.2-(p/15) = 0
0.10714286-1/15*p = 0 // - 0.10714286
-1/15*p = -0.10714286 // : -1/15
p = -0.10714286/(-1/15)
p = 1.60714282
p = 1.60714282
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