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