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p in (-oo:+oo)
(1/4)*p-((3/8)*p) = 4 // - 4
(1/4)*p-((3/8)*p)-4 = 0
(1/4)*p+(-3/8)*p-4 = 0
-1/8*p-4 = 0 // + 4
-1/8*p = 4 // : -1/8
p = 4/(-1/8)
p = -32
p = -32
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