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p in (-oo:+oo)
(p-6)/2 = p-4 // - p-4
(p-6)/2-p+4 = 0
(p-6)/2+(2*(-p))/2+(2*4)/2 = 0
p+2*(-p)+2*4-6 = 0
8-p-6 = 0
2-p = 0
(2-p)/2 = 0
(2-p)/2 = 0 // * 2
2-p = 0
2-p = 0 // - 2
-p = -2 // * -1
p = 2
p = 2
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