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x in (-oo:+oo)
r = (p/4)*(H+c) // - (p/4)*(H+c)
r-((p/4)*(H+c)) = 0
r-1*1/4*p*(H+c) = 0
r-1*1/4*p*(H+c) = 0
r-1/4*c*p-1/4*H*p = 0
r-1/4*c*p-1/4*H*p = 0
x belongs to the empty set
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