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f in (-oo:+oo)
326.89 = (5/9)*(f-32) // - (5/9)*(f-32)
326.89-((5/9)*(f-32)) = 0
(-5/9)*(f-32)+326.89 = 0
326.89-5/9*(f-32) = 0
326.89-5/9*(f-32) = 0
344.66777778-5/9*f = 0
344.66777778-5/9*f = 0
344.66777778-5/9*f = 0 // - 344.66777778
-5/9*f = -344.66777778 // : -5/9
f = -344.66777778/(-5/9)
f = 620.40199504
f = 620.40199504
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