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p in (-oo:+oo)
3 = (1/2)*p+81/2 // - (1/2)*p+81/2
3-((1/2)*p)-(81/2) = 0
(-1/2)*p-81/2+3 = 0
-1/2*p-75/2 = 0 // + 75/2
-1/2*p = 75/2 // : -1/2
p = 75/2/(-1/2)
p = -75
p = -75
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