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F in (-oo:+oo)
(5/9)*(F-32) = 12 // - 12
(5/9)*(F-32)-12 = 0
5/9*(F-32)-12 = 0
5/9*(F-32)-12 = 0
5/9*F-268/9 = 0
5/9*F-268/9 = 0
5/9*F-268/9 = 0 // + 268/9
5/9*F = 268/9 // : 5/9
F = 268/9/5/9
F = 268/5
F = 268/5
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