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p in (-oo:+oo)
2*(p+1/2)+p = 3*p-4+9 // - 3*p-4+9
2*(p+1/2)+p-(3*p)-9+4 = 0
2*(p+1/2)+p-3*p-9+4 = 0
2*(p+1/2)+p-3*p-9+4 = 0
3*p-3*p-9+1+4 = 0
1-9+4 = 0
4-8 = 0
-4 = 0
-4 = 0
p belongs to the empty set
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