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F in (-oo:+oo)
38 < (5*(F-32))/9 // - (5*(F-32))/9
38-((5*(F-32))/9) < 0
(-5/9)*(F-32)+38 < 0
38-5/9*(F-32) < 0
38-5/9*(F-32) < 0
502/9-5/9*F < 0
502/9-5/9*F < 0
502/9-5/9*F < 0 // - 502/9
-5/9*F < -502/9 // : -5/9
F > -502/9/(-5/9)
F > 502/5
(-oo:502/5) (502/5:+oo) 502/9-5/9*F + -
F in (502/5:+oo)
(502/5:+oo)
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