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f in (-oo:+oo)
(5/9)*(f-32) = 62.1 // - 62.1
(5/9)*(f-32)-62.1 = 0
5/9*(f-32)-62.1 = 0
5/9*(f-32)-62.1 = 0
5/9*f-79.87777778 = 0
5/9*f-79.87777778 = 0
5/9*f-79.87777778 = 0 // + 79.87777778
5/9*f = 79.87777778 // : 5/9
f = 79.87777778/5/9
f = 143.77999885
f = 143.77999885
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