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d in (-oo:+oo)
1/6 = (-2/3)*d // - (-2/3)*d
1/6-((-2/3)*d) = 0
(2/3)*d+1/6 = 0
2/3*d+1/6 = 0 // - 1/6
2/3*d = -1/6 // : 2/3
d = -1/6/2/3
d = -1/4
d = -1/4
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