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p in (-oo:+oo)
(-1/2)*p-3 = 3 // - 3
(-1/2)*p-3-3 = 0
-1/2*p-6 = 0 // + 6
-1/2*p = 6 // : -1/2
p = 6/(-1/2)
p = -12
p = -12
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