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