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p in (-oo:+oo)
2/5 = (16/4)*p // - (16/4)*p
2/5-((16/4)*p) = 0
2/5-4*p = 0
2/5-4*p = 0 // - 2/5
-4*p = -2/5 // : -4
p = -2/5/(-4)
p = 1/10
p = 1/10
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