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f in (-oo:+oo)
f/9 = 4/6 // - 4/6
f/9-(4/6) = 0
f/9-2/3 = 0
1/9*f-2/3 = 0 // + 2/3
1/9*f = 2/3 // : 1/9
f = 2/3/1/9
f = 6
f = 6
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