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f in (-oo:+oo)
-12 = (5/9)*(f-32) // - (5/9)*(f-32)
-((5/9)*(f-32))-12 = 0
(-5/9)*(f-32)-12 = 0
-5/9*(f-32)-12 = 0
-5/9*(f-32)-12 = 0
52/9-5/9*f = 0
52/9-5/9*f = 0
52/9-5/9*f = 0 // - 52/9
-5/9*f = -52/9 // : -5/9
f = -52/9/(-5/9)
f = 52/5
f = 52/5
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