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x in (-oo:+oo)
C = (6/5)*(k-57) // - (6/5)*(k-57)
C-((6/5)*(k-57)) = 0
(-6/5)*(k-57)+C = 0
C-6/5*(k-57) = 0
C-6/5*(k-57) = 0
C-6/5*k+342/5 = 0
C-6/5*k+342/5 = 0
x belongs to the empty set
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