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p in (-oo:+oo)
8.125 = (1/2)*p+6.5 // - (1/2)*p+6.5
8.125-((1/2)*p)-6.5 = 0
(-1/2)*p-6.5+8.125 = 0
1.625-1/2*p = 0 // - 1.625
-1/2*p = -1.625 // : -1/2
p = -1.625/(-1/2)
p = 3.25
p = 3.25
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