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x in (-oo:+oo)
c = (5/8)*(f-32) // - (5/8)*(f-32)
c-((5/8)*(f-32)) = 0
(-5/8)*(f-32)+c = 0
c-5/8*(f-32) = 0
c-5/8*(f-32) = 0
c-5/8*f+20 = 0
c-5/8*f+20 = 0
x belongs to the empty set
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