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f in (-oo:+oo)
-34.18 = (5/9)*(f-32) // - (5/9)*(f-32)
-((5/9)*(f-32))-34.18 = 0
(-5/9)*(f-32)-34.18 = 0
-5/9*(f-32)-34.18 = 0
-5/9*(f-32)-34.18 = 0
-5/9*f-16.40222222 = 0
-5/9*f-16.40222222 = 0
-5/9*f-16.40222222 = 0 // + 16.40222222
-5/9*f = 16.40222222 // : -5/9
f = 16.40222222/(-5/9)
f = -29.52399976
f = -29.52399976
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