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F in (-oo:+oo)
(5/9)*(F-32) < 13 // - 13
(5/9)*(F-32)-13 < 0
5/9*(F-32)-13 < 0
5/9*(F-32)-13 < 0
5/9*F-277/9 < 0
5/9*F-277/9 < 0
5/9*F-277/9 < 0 // + 277/9
5/9*F < 277/9 // : 5/9
F < 277/9/5/9
F < 277/5
(-oo:277/5) (277/5:+oo) 5/9*F-277/9 - +
F in (-oo:277/5)
(-oo:277/5)
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