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p in (-oo:+oo)
2.5/5 = p/4 // - p/4
2.5/5-(p/4) = 0
0.5-1/4*p = 0 // - 0.5
-1/4*p = -0.5 // : -1/4
p = -0.5/(-1/4)
p = 2
p = 2
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