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x in (-oo:+oo)
c = (6/5)*(k-31) // - (6/5)*(k-31)
c-((6/5)*(k-31)) = 0
(-6/5)*(k-31)+c = 0
c-6/5*(k-31) = 0
c-6/5*(k-31) = 0
c-6/5*k+186/5 = 0
c-6/5*k+186/5 = 0
x belongs to the empty set
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