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p in (-oo:+oo)
7-((1/2)*p) = -4 // + 4
4-((1/2)*p)+7 = 0
(-1/2)*p+4+7 = 0
11-1/2*p = 0 // - 11
-1/2*p = -11 // : -1/2
p = -11/(-1/2)
p = 22
p = 22
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