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x in (-oo:+oo)
F = (9/5)*(k-273.15) // - (9/5)*(k-273.15)
F-((9/5)*(k-273.15)) = 0
(-9/5)*(k-273.15)+F = 0
F-9/5*(k-273.15) = 0
F-9/5*(k-273.15) = 0
F-9/5*k+491.67 = 0
F-9/5*k+491.67 = 0
x belongs to the empty set
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