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F in (-oo:+oo)
F/21 = 2/14 // - 2/14
F/21-(2/14) = 0
F/21-1/7 = 0
1/21*F-1/7 = 0 // + 1/7
1/21*F = 1/7 // : 1/21
F = 1/7/1/21
F = 3
F = 3
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