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p in (-oo:+oo)
p-((3/5)*p) = 20 // - 20
p-((3/5)*p)-20 = 0
p+(-3/5)*p-20 = 0
2/5*p-20 = 0 // + 20
2/5*p = 20 // : 2/5
p = 20/2/5
p = 50
p = 50
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