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p in (-oo:+oo)
-9 = p/3+15 // - p/3+15
-(p/3)-15-9 = 0
-1/3*p-24 = 0 // + 24
-1/3*p = 24 // : -1/3
p = 24/(-1/3)
p = -72
p = -72
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