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f in (-oo:+oo)
18/5 = (f-32)/9 // - (f-32)/9
18/5-((f-32)/9) = 0
(-1*(f-32))/9+18/5 = 0
(-1*5*(f-32))/(5*9)+(9*18)/(5*9) = 0
9*18-1*5*(f-32) = 0
322-5*f = 0
(322-5*f)/(5*9) = 0
(322-5*f)/(5*9) = 0 // * 5*9
322-5*f = 0
322-5*f = 0 // - 322
-5*f = -322 // : -5
f = -322/(-5)
f = 322/5
f = 322/5
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