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f in (-oo:+oo)
-30 = (5/9)*(f-32) // - (5/9)*(f-32)
-((5/9)*(f-32))-30 = 0
(-5/9)*(f-32)-30 = 0
-5/9*(f-32)-30 = 0
-5/9*(f-32)-30 = 0
-5/9*f-110/9 = 0
-5/9*f-110/9 = 0
-5/9*f-110/9 = 0 // + 110/9
-5/9*f = 110/9 // : -5/9
f = 110/9/(-5/9)
f = -22
f = -22
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