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d in (-oo:+oo)
8/9 = 6*d // - 6*d
8/9-(6*d) = 0
8/9-6*d = 0
8/9-6*d = 0 // - 8/9
-6*d = -8/9 // : -6
d = -8/9/(-6)
d = 4/27
d = 4/27
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