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F in (-oo:+oo)
31 = (5/9)*(F-32) // - (5/9)*(F-32)
31-((5/9)*(F-32)) = 0
(-5/9)*(F-32)+31 = 0
31-5/9*(F-32) = 0
31-5/9*(F-32) = 0
439/9-5/9*F = 0
439/9-5/9*F = 0
439/9-5/9*F = 0 // - 439/9
-5/9*F = -439/9 // : -5/9
F = -439/9/(-5/9)
F = 439/5
F = 439/5
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