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p in (-oo:+oo)
(p+3)/2 = 8 // - 8
(p+3)/2-8 = 0
(p+3)/2+(-8*2)/2 = 0
p-8*2+3 = 0
p-13 = 0
(p-13)/2 = 0
(p-13)/2 = 0 // * 2
p-13 = 0
p-13 = 0 // + 13
p = 13
p = 13
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