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p in (-oo:+oo)
(-1/3)*p-6 = -11 // + 11
(-1/3)*p-6+11 = 0
5-1/3*p = 0 // - 5
-1/3*p = -5 // : -1/3
p = -5/(-1/3)
p = 15
p = 15
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