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d in (-oo:+oo)
-28 = (1/14)*d // - (1/14)*d
-((1/14)*d)-28 = 0
(-1/14)*d-28 = 0
-1/14*d-28 = 0 // + 28
-1/14*d = 28 // : -1/14
d = 28/(-1/14)
d = -392
d = -392
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