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x in (-oo:+oo)
C = (5/2)*(f-32) // - (5/2)*(f-32)
C-((5/2)*(f-32)) = 0
(-5/2)*(f-32)+C = 0
C-5/2*(f-32) = 0
C-5/2*(f-32) = 0
C-5/2*f+80 = 0
C-5/2*f+80 = 0
x belongs to the empty set
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