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x in (-oo:+oo)
H = (1/3)*(a+2*p+3) // - (1/3)*(a+2*p+3)
H-((1/3)*(a+2*p+3)) = 0
(-1/3)*(a+2*p+3)+H = 0
H-1/3*(a+2*p+3) = 0
H-1/3*(a+2*p+3) = 0
H-1/3*a-2/3*p-1 = 0
H-1/3*a-2/3*p-1 = 0
x belongs to the empty set
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