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x in (-oo:+oo)
c = (9/5)*(k-83) // - (9/5)*(k-83)
c-((9/5)*(k-83)) = 0
(-9/5)*(k-83)+c = 0
c-9/5*(k-83) = 0
c-9/5*(k-83) = 0
c-9/5*k+747/5 = 0
c-9/5*k+747/5 = 0
x belongs to the empty set
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