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