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F in (-oo:+oo)
F/9 = 5/6 // - 5/6
F/9-(5/6) = 0
F/9-5/6 = 0
1/9*F-5/6 = 0 // + 5/6
1/9*F = 5/6 // : 1/9
F = 5/6/1/9
F = 15/2
F = 15/2
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