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f in (-oo:+oo)
-36.14 = (5/9)*(f-32) // - (5/9)*(f-32)
-((5/9)*(f-32))-36.14 = 0
(-5/9)*(f-32)-36.14 = 0
-5/9*(f-32)-36.14 = 0
-5/9*(f-32)-36.14 = 0
-5/9*f-18.36222222 = 0
-5/9*f-18.36222222 = 0
-5/9*f-18.36222222 = 0 // + 18.36222222
-5/9*f = 18.36222222 // : -5/9
f = 18.36222222/(-5/9)
f = -33.05199973
f = -33.05199973
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