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p in (-oo:+oo)
(1/5)*p-4 = (2/5)*p // - (2/5)*p
(1/5)*p-((2/5)*p)-4 = 0
(1/5)*p+(-2/5)*p-4 = 0
-1/5*p-4 = 0 // + 4
-1/5*p = 4 // : -1/5
p = 4/(-1/5)
p = -20
p = -20
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