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f in (-oo:+oo)
42 = (5/9)*(f-32) // - (5/9)*(f-32)
42-((5/9)*(f-32)) = 0
(-5/9)*(f-32)+42 = 0
42-5/9*(f-32) = 0
42-5/9*(f-32) = 0
538/9-5/9*f = 0
538/9-5/9*f = 0
538/9-5/9*f = 0 // - 538/9
-5/9*f = -538/9 // : -5/9
f = -538/9/(-5/9)
f = 538/5
f = 538/5
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