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