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F in (-oo:+oo)
-10 = (5/9)*(F-32) // - (5/9)*(F-32)
-((5/9)*(F-32))-10 = 0
(-5/9)*(F-32)-10 = 0
-5/9*(F-32)-10 = 0
-5/9*(F-32)-10 = 0
70/9-5/9*F = 0
70/9-5/9*F = 0
70/9-5/9*F = 0 // - 70/9
-5/9*F = -70/9 // : -5/9
F = -70/9/(-5/9)
F = 14
F = 14
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