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x in (-oo:+oo)
K = (3/2)*(k-9) // - (3/2)*(k-9)
K-((3/2)*(k-9)) = 0
(-3/2)*(k-9)+K = 0
K-3/2*(k-9) = 0
K-3/2*(k-9) = 0
K-3/2*k+27/2 = 0
K-3/2*k+27/2 = 0
x belongs to the empty set
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