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p in (-oo:+oo)
(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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