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p in (-oo:+oo)
(-4/5)*p = 2/3 // - 2/3
(-4/5)*p-(2/3) = 0
(-4/5)*p-2/3 = 0
-4/5*p-2/3 = 0 // + 2/3
-4/5*p = 2/3 // : -4/5
p = 2/3/(-4/5)
p = -5/6
p = -5/6
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