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p in (-oo:+oo)
(-4/5)*p = 8/25 // - 8/25
(-4/5)*p-(8/25) = 0
(-4/5)*p-8/25 = 0
-4/5*p-8/25 = 0 // + 8/25
-4/5*p = 8/25 // : -4/5
p = 8/25/(-4/5)
p = -2/5
p = -2/5
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