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d in (-oo:+oo)
1/9 = (-2/3)*d-((1/3)*d)+7/9 // - (-2/3)*d-((1/3)*d)+7/9
(1/3)*d-((-2/3)*d)+1/9-(7/9) = 0
(2/3)*d+(1/3)*d+1/9-7/9 = 0
d-2/3 = 0 // + 2/3
d = 2/3
d = 2/3
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