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F in (-oo:+oo)
(5/9)*(F-32) = -20 // + 20
(5/9)*(F-32)+20 = 0
5/9*(F-32)+20 = 0
5/9*(F-32)+20 = 0
5/9*F+20/9 = 0
5/9*F+20/9 = 0
5/9*F+20/9 = 0 // - 20/9
5/9*F = -20/9 // : 5/9
F = -20/9/5/9
F = -4
F = -4
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