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f in (-oo:+oo)
5/9 = f+1/3 // - f+1/3
5/9-f-(1/3) = 0
5/9-f-1/3 = 0
2/9-f = 0 // - 2/9
-f = -2/9 // * -1
f = 2/9
f = 2/9
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