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p in (-oo:+oo)
p/4-((3*p)/8) = 3 // - 3
p/4-((3*p)/8)-3 = 0
p/4+(-3/8)*p-3 = 0
-1/8*p-3 = 0 // + 3
-1/8*p = 3 // : -1/8
p = 3/(-1/8)
p = -24
p = -24
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