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p in (-oo:+oo)
(1/3)*p = 4/5 // - 4/5
(1/3)*p-(4/5) = 0
(1/3)*p-4/5 = 0
1/3*p-4/5 = 0 // + 4/5
1/3*p = 4/5 // : 1/3
p = 4/5/1/3
p = 12/5
p = 12/5
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