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p in (-oo:+oo)
p/2 = p+7/8 // - p+7/8
p/2-p-(7/8) = 0
p/2-p-7/8 = 0
-1/2*p-7/8 = 0 // + 7/8
-1/2*p = 7/8 // : -1/2
p = 7/8/(-1/2)
p = -7/4
p = -7/4
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