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f in (-oo:+oo)
20 = (5/9)*(f-32) // - (5/9)*(f-32)
20-((5/9)*(f-32)) = 0
(-5/9)*(f-32)+20 = 0
20-5/9*(f-32) = 0
20-5/9*(f-32) = 0
340/9-5/9*f = 0
340/9-5/9*f = 0
340/9-5/9*f = 0 // - 340/9
-5/9*f = -340/9 // : -5/9
f = -340/9/(-5/9)
f = 68
f = 68
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