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p in (-oo:+oo)
-13/18 = (13/8)*(p+1) // - (13/8)*(p+1)
-((13/8)*(p+1))-13/18 = 0
(-13/8)*(p+1)-13/18 = 0
-13/8*(p+1)-13/18 = 0
(-13/8*18*(p+1))/18-13/18 = 0
-13/8*18*(p+1)-13 = 0
-117/4*p-169/4 = 0
(-117/4*p-169/4)/18 = 0
(-117/4*p-169/4)/18 = 0 // * 18
-117/4*p-169/4 = 0
-117/4*p-169/4 = 0 // + 169/4
-117/4*p = 169/4 // : -117/4
p = 169/4/(-117/4)
p = -13/9
p = -13/9
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