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