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p in (-oo:+oo)
9 = (3-6*p)/(-8) // - (3-6*p)/(-8)
9-((3-6*p)/(-8)) = 0
(-1*(3-6*p))/(-8)+9 = 0
(-1*(3-6*p))/(-8)+(-8*9)/(-8) = 0
-1*(3-6*p)-8*9 = 0
6*p-75 = 0
(6*p-75)/(-8) = 0
(6*p-75)/(-8) = 0 // * -8
6*p-75 = 0
6*p-75 = 0 // + 75
6*p = 75 // : 6
p = 75/6
p = 25/2
p = 25/2
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