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F in (-oo:+oo)
F/4 = 2/3 // - 2/3
F/4-(2/3) = 0
F/4-2/3 = 0
1/4*F-2/3 = 0 // + 2/3
1/4*F = 2/3 // : 1/4
F = 2/3/1/4
F = 8/3
F = 8/3
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