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p in (-oo:+oo)
(1/8)*(p+9) = 4 // - 4
(1/8)*(p+9)-4 = 0
1/8*(p+9)-4 = 0
1/8*(p+9)-4 = 0
1/8*p-23/8 = 0
1/8*p-23/8 = 0
1/8*p-23/8 = 0 // + 23/8
1/8*p = 23/8 // : 1/8
p = 23/8/1/8
p = 23
p = 23
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