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p in (-oo:+oo)
-5/3 = p/15 // - p/15
-(p/15)-5/3 = 0
-1/15*p-5/3 = 0 // + 5/3
-1/15*p = 5/3 // : -1/15
p = 5/3/(-1/15)
p = -25
p = -25
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