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f in (-oo:+oo)
-9 = (5/9)*(f-32) // - (5/9)*(f-32)
-((5/9)*(f-32))-9 = 0
(-5/9)*(f-32)-9 = 0
-5/9*(f-32)-9 = 0
-5/9*(f-32)-9 = 0
79/9-5/9*f = 0
79/9-5/9*f = 0
79/9-5/9*f = 0 // - 79/9
-5/9*f = -79/9 // : -5/9
f = -79/9/(-5/9)
f = 79/5
f = 79/5
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