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x in (-oo:+oo)
H = (2/3)*(k-5) // - (2/3)*(k-5)
H-((2/3)*(k-5)) = 0
(-2/3)*(k-5)+H = 0
H-2/3*(k-5) = 0
H-2/3*(k-5) = 0
H-2/3*k+10/3 = 0
H-2/3*k+10/3 = 0
x belongs to the empty set
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