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p in (-oo:+oo)
(3*p)/7 = 4/5 // - 4/5
(3*p)/7-(4/5) = 0
(3*p)/7-4/5 = 0
3/7*p-4/5 = 0 // + 4/5
3/7*p = 4/5 // : 3/7
p = 4/5/3/7
p = 28/15
p = 28/15
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