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f in (-oo:+oo)
40*(9/5) = (9/5)*(5/9)*(f-32) // - (9/5)*(5/9)*(f-32)
40*(9/5)-((9/5)*(5/9)*(f-32)) = 0
40*(9/5)-f+32 = 0
104-f = 0 // - 104
-f = -104 // * -1
f = 104
f = 104
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