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f in (-oo:+oo)
273.15 = (5/9)*(f-32)+273.15 // - (5/9)*(f-32)+273.15
273.15-((5/9)*(f-32))-273.15 = 0
(-5/9)*(f-32)-273.15+273.15 = 0
273.15-5/9*(f-32)-273.15 = 0
273.15-5/9*(f-32)-273.15 = 0
273.15-5/9*f-255.37222222 = 0
17.77777778-5/9*f = 0
17.77777778-5/9*f = 0
17.77777778-5/9*f = 0 // - 17.77777778
-5/9*f = -17.77777778 // : -5/9
f = -17.77777778/(-5/9)
f = 31.99999975
f = 31.99999975
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