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p in (-oo:+oo)
(2/3)*p+1/5 = 4/5 // - 4/5
(2/3)*p+1/5-(4/5) = 0
(2/3)*p+1/5-4/5 = 0
2/3*p-3/5 = 0 // + 3/5
2/3*p = 3/5 // : 2/3
p = 3/5/2/3
p = 9/10
p = 9/10
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