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d in (-oo:+oo)
-1/6 = (15/42)*d // - (15/42)*d
-((15/42)*d)-1/6 = 0
(-5/14)*d-1/6 = 0
-5/14*d-1/6 = 0 // + 1/6
-5/14*d = 1/6 // : -5/14
d = 1/6/(-5/14)
d = -7/15
d = -7/15
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