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f in (-oo:+oo)
104 = (5/9)*(f-32) // - (5/9)*(f-32)
104-((5/9)*(f-32)) = 0
(-5/9)*(f-32)+104 = 0
104-5/9*(f-32) = 0
104-5/9*(f-32) = 0
1096/9-5/9*f = 0
1096/9-5/9*f = 0
1096/9-5/9*f = 0 // - 1096/9
-5/9*f = -1096/9 // : -5/9
f = -1096/9/(-5/9)
f = 1096/5
f = 1096/5
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