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p in (-oo:+oo)
(1/3)*p = (2/5)*p+2/3 // - (2/5)*p+2/3
(1/3)*p-((2/5)*p)-(2/3) = 0
(1/3)*p+(-2/5)*p-2/3 = 0
-1/15*p-2/3 = 0 // + 2/3
-1/15*p = 2/3 // : -1/15
p = 2/3/(-1/15)
p = -10
p = -10
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