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F in (-oo:+oo)
F = (9/5)*(F-32) // - (9/5)*(F-32)
F-((9/5)*(F-32)) = 0
(-9/5)*(F-32)+F = 0
F-9/5*(F-32) = 0
F-9/5*(F-32) = 0
288/5-4/5*F = 0
288/5-4/5*F = 0
288/5-4/5*F = 0 // - 288/5
-4/5*F = -288/5 // : -4/5
F = -288/5/(-4/5)
F = 72
F = 72
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