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f in (-oo:+oo)
3*f = 2/7 // - 2/7
3*f-(2/7) = 0
3*f-2/7 = 0
3*f-2/7 = 0 // + 2/7
3*f = 2/7 // : 3
f = 2/7/3
f = 2/21
f = 2/21
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