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d in (-oo:+oo)
4-(2*d) = 2/3 // - 2/3
4-(2*d)-(2/3) = 0
4-2*d-2/3 = 0
10/3-2*d = 0 // - 10/3
-2*d = -10/3 // : -2
d = -10/3/(-2)
d = 5/3
d = 5/3
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