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f in (-oo:+oo)
60.6 = (5/9)*(f-32) // - (5/9)*(f-32)
60.6-((5/9)*(f-32)) = 0
(-5/9)*(f-32)+60.6 = 0
60.6-5/9*(f-32) = 0
60.6-5/9*(f-32) = 0
78.37777778-5/9*f = 0
78.37777778-5/9*f = 0
78.37777778-5/9*f = 0 // - 78.37777778
-5/9*f = -78.37777778 // : -5/9
f = -78.37777778/(-5/9)
f = 141.07999888
f = 141.07999888
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