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F in (-oo:+oo)
(5/9)*(F-32) = 25 // - 25
(5/9)*(F-32)-25 = 0
5/9*(F-32)-25 = 0
5/9*(F-32)-25 = 0
5/9*F-385/9 = 0
5/9*F-385/9 = 0
5/9*F-385/9 = 0 // + 385/9
5/9*F = 385/9 // : 5/9
F = 385/9/5/9
F = 77
F = 77
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