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d in (-oo:+oo)
2/3 = 8*d // - 8*d
2/3-(8*d) = 0
2/3-8*d = 0
2/3-8*d = 0 // - 2/3
-8*d = -2/3 // : -8
d = -2/3/(-8)
d = 1/12
d = 1/12
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