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