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f in (-oo:+oo)
(5/9)*(f-32) = -62.5 // + 62.5
(5/9)*(f-32)+62.5 = 0
5/9*(f-32)+62.5 = 0
5/9*(f-32)+62.5 = 0
5/9*f+44.72222222 = 0
5/9*f+44.72222222 = 0
5/9*f+44.72222222 = 0 // - 44.72222222
5/9*f = -44.72222222 // : 5/9
f = -44.72222222/5/9
f = -80.49999935
f = -80.49999935
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