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x in (-oo:+oo)
h = (1/4)*(g+h-k) // - (1/4)*(g+h-k)
h-((1/4)*(g+h-k)) = 0
(-1/4)*(g+h-k)+h = 0
h-1/4*(g+h-k) = 0
h-1/4*(g+h-k) = 0
3/4*h-1/4*g+1/4*k = 0
3/4*h-1/4*g+1/4*k = 0
x belongs to the empty set
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