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