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F in (-oo:+oo)
-15 = (5/9)*(F-32) // - (5/9)*(F-32)
-((5/9)*(F-32))-15 = 0
(-5/9)*(F-32)-15 = 0
-5/9*(F-32)-15 = 0
-5/9*(F-32)-15 = 0
25/9-5/9*F = 0
25/9-5/9*F = 0
25/9-5/9*F = 0 // - 25/9
-5/9*F = -25/9 // : -5/9
F = -25/9/(-5/9)
F = 5
F = 5
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