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d in (-oo:+oo)
1/9 = (1/18)*d // - (1/18)*d
1/9-((1/18)*d) = 0
(-1/18)*d+1/9 = 0
1/9-1/18*d = 0 // - 1/9
-1/18*d = -1/9 // : -1/18
d = -1/9/(-1/18)
d = 2
d = 2
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