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x in (-oo:+oo)
c = (5/9)*(f-32) // - (5/9)*(f-32)
c-((5/9)*(f-32)) = 0
(-5/9)*(f-32)+c = 0
c-5/9*(f-32) = 0
c-5/9*(f-32) = 0
c-5/9*f+160/9 = 0
c-5/9*f+160/9 = 0
x belongs to the empty set
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