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