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p in (-oo:+oo)
-((5/6)*p)-12 = 3 // - 3
-((5/6)*p)-12-3 = 0
(-5/6)*p-12-3 = 0
-5/6*p-15 = 0 // + 15
-5/6*p = 15 // : -5/6
p = 15/(-5/6)
p = -18
p = -18
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