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p in (-oo:+oo)
0.45/4.2 = p/4 // - p/4
0.45/4.2-(p/4) = 0
0.10714286-1/4*p = 0 // - 0.10714286
-1/4*p = -0.10714286 // : -1/4
p = -0.10714286/(-1/4)
p = 0.42857144
p = 0.42857144
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