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p in (-oo:+oo)
(1/2)*(4*p-6) = 2*p+8 // - 2*p+8
(1/2)*(4*p-6)-(2*p)-8 = 0
(1/2)*(4*p-6)-2*p-8 = 0
1/2*(4*p-6)-2*p-8 = 0
1/2*(4*p-6)-2*p-8 = 0
-8-3 = 0
-11 = 0
-11 = 0
p belongs to the empty set
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