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f in (-oo:+oo)
(5/9)*(f-32)+273.15 = 0
5/9*(f-32)+273.15 = 0
5/9*(f-32)+273.15 = 0
5/9*f+255.37222222 = 0
5/9*f+255.37222222 = 0
5/9*f+255.37222222 = 0 // - 255.37222222
5/9*f = -255.37222222 // : 5/9
f = -255.37222222/5/9
f = -459.66999632
f = -459.66999632
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