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f in (-oo:+oo)
(5/9)*(f-32) = 27 // - 27
(5/9)*(f-32)-27 = 0
5/9*(f-32)-27 = 0
5/9*(f-32)-27 = 0
5/9*f-403/9 = 0
5/9*f-403/9 = 0
5/9*f-403/9 = 0 // + 403/9
5/9*f = 403/9 // : 5/9
f = 403/9/5/9
f = 403/5
f = 403/5
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