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F in (-oo:+oo)
42/56 = 6*F // - 6*F
42/56-(6*F) = 0
42/56-6*F = 0
3/4-6*F = 0 // - 3/4
-6*F = -3/4 // : -6
F = -3/4/(-6)
F = 1/8
F = 1/8
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