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f in (-oo:+oo)
(f/1)/6 = 3/7 // - 3/7
(f/1)/6-(3/7) = 0
f/6-3/7 = 0
1/6*f-3/7 = 0 // + 3/7
1/6*f = 3/7 // : 1/6
f = 3/7/1/6
f = 18/7
f = 18/7
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