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