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x in (-oo:+oo)
C = (7/6)*(k-11) // - (7/6)*(k-11)
C-((7/6)*(k-11)) = 0
(-7/6)*(k-11)+C = 0
C-7/6*(k-11) = 0
C-7/6*(k-11) = 0
C-7/6*k+77/6 = 0
C-7/6*k+77/6 = 0
x belongs to the empty set
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