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p in (-oo:+oo)
(-1/2)*p-7 = -11 // + 11
(-1/2)*p-7+11 = 0
4-1/2*p = 0 // - 4
-1/2*p = -4 // : -1/2
p = -4/(-1/2)
p = 8
p = 8
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