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x in (-oo:+oo)
f = (1/2)*(g+h-k) // - (1/2)*(g+h-k)
f-((1/2)*(g+h-k)) = 0
(-1/2)*(g+h-k)+f = 0
f-1/2*(g+h-k) = 0
f-1/2*(g+h-k) = 0
f-1/2*g-1/2*h+1/2*k = 0
f-1/2*g-1/2*h+1/2*k = 0
x belongs to the empty set
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