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p in (-oo:+oo)
p/2 = p+3/8 // - p+3/8
p/2-p-(3/8) = 0
p/2-p-3/8 = 0
-1/2*p-3/8 = 0 // + 3/8
-1/2*p = 3/8 // : -1/2
p = 3/8/(-1/2)
p = -3/4
p = -3/4
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