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p in (-oo:+oo)
(3/5)*p-(4/5) = (2/3)*p // - (2/3)*p
(3/5)*p-((2/3)*p)-(4/5) = 0
(3/5)*p+(-2/3)*p-4/5 = 0
-1/15*p-4/5 = 0 // + 4/5
-1/15*p = 4/5 // : -1/15
p = 4/5/(-1/15)
p = -12
p = -12
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