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p in (-oo:+oo)
-8/9 = p/72 // - p/72
-(p/72)-8/9 = 0
-1/72*p-8/9 = 0 // + 8/9
-1/72*p = 8/9 // : -1/72
p = 8/9/(-1/72)
p = -64
p = -64
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