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p in (-oo:+oo)
1/5-((1/2)*p) = 5/8 // - 5/8
1/5-((1/2)*p)-(5/8) = 0
(-1/2)*p+1/5-5/8 = 0
-1/2*p-17/40 = 0 // + 17/40
-1/2*p = 17/40 // : -1/2
p = 17/40/(-1/2)
p = -17/20
p = -17/20
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