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p in (-oo:+oo)
-(15*p)-1/5 = 4/5-3*p-(5*p) // - 4/5-3*p-(5*p)
5*p-(15*p)-(-3*p)-1/5-(4/5) = 0
3*p-15*p+5*p-1/5-4/5 = 0
-7*p-1 = 0 // + 1
-7*p = 1 // : -7
p = 1/(-7)
p = -1/7
p = -1/7
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