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p in (-oo:+oo)
-4 = (1/2)*p-7 // - (1/2)*p-7
7-((1/2)*p)-4 = 0
(-1/2)*p-4+7 = 0
3-1/2*p = 0 // - 3
-1/2*p = -3 // : -1/2
p = -3/(-1/2)
p = 6
p = 6
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