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p in (-oo:+oo)
-9/8 = p/72 // - p/72
-(p/72)-9/8 = 0
-1/72*p-9/8 = 0 // + 9/8
-1/72*p = 9/8 // : -1/72
p = 9/8/(-1/72)
p = -81
p = -81
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