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