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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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