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