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p in (-oo:+oo)
2004 = (1/2)*p // - (1/2)*p
2004-((1/2)*p) = 0
(-1/2)*p+2004 = 0
2004-1/2*p = 0 // - 2004
-1/2*p = -2004 // : -1/2
p = -2004/(-1/2)
p = 4008
p = 4008
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