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f in (-oo:+oo)
-62.1 = (5/9)*(f-32) // - (5/9)*(f-32)
-((5/9)*(f-32))-62.1 = 0
(-5/9)*(f-32)-62.1 = 0
-5/9*(f-32)-62.1 = 0
-5/9*(f-32)-62.1 = 0
-5/9*f-44.32222222 = 0
-5/9*f-44.32222222 = 0
-5/9*f-44.32222222 = 0 // + 44.32222222
-5/9*f = 44.32222222 // : -5/9
f = 44.32222222/(-5/9)
f = -79.77999936
f = -79.77999936
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