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p in (-oo:+oo)
4*(2-((1/8)*p)) = (1/4)*p-7 // - (1/4)*p-7
4*(2-((1/8)*p))-((1/4)*p)+7 = 0
4*((-1/8)*p+2)+(-1/4)*p+7 = 0
4*(2-1/8*p)-p/4+7 = 0
(4^2*(2-1/8*p))/4-p/4+(4*7)/4 = 0
4^2*(2-1/8*p)-p+4*7 = 0
28-3*p+32 = 0
60-3*p = 0
(60-3*p)/4 = 0
(60-3*p)/4 = 0 // * 4
60-3*p = 0
60-3*p = 0 // - 60
-3*p = -60 // : -3
p = -60/(-3)
p = 20
p = 20
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