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f in (-oo:+oo)
(5/9)*(f-32) = -18 // + 18
(5/9)*(f-32)+18 = 0
5/9*(f-32)+18 = 0
5/9*(f-32)+18 = 0
5/9*f+2/9 = 0
5/9*f+2/9 = 0
5/9*f+2/9 = 0 // - 2/9
5/9*f = -2/9 // : 5/9
f = -2/9/5/9
f = -2/5
f = -2/5
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