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d in (-oo:+oo)
1/8 = (1/16)*d // - (1/16)*d
1/8-((1/16)*d) = 0
(-1/16)*d+1/8 = 0
1/8-1/16*d = 0 // - 1/8
-1/16*d = -1/8 // : -1/16
d = -1/8/(-1/16)
d = 2
d = 2
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