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x in (-oo:+oo)
c = (7/3)*(k-88) // - (7/3)*(k-88)
c-((7/3)*(k-88)) = 0
(-7/3)*(k-88)+c = 0
c-7/3*(k-88) = 0
c-7/3*(k-88) = 0
c-7/3*k+616/3 = 0
c-7/3*k+616/3 = 0
x belongs to the empty set
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