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p in (-oo:+oo)
3*p-(p/7)-(1/5) = 3 // - 3
3*p-(p/7)-(1/5)-3 = 0
3*p-(p/7)-1/5-3 = 0
20/7*p-16/5 = 0 // + 16/5
20/7*p = 16/5 // : 20/7
p = 16/5/20/7
p = 28/25
p = 28/25
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