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p in (-oo:+oo)
4 = p/2.7 // - p/2.7
4-(p/2.7) = 0
4-0.37037037*p = 0
4-0.37037037*p = 0 // - 4
-0.37037037*p = -4 // : -0.37037037
p = -4/(-0.37037037)
p = 10.80000001
p = 10.80000001
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