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d in (-oo:+oo)
-28 = (4/5)*d // - (4/5)*d
-((4/5)*d)-28 = 0
(-4/5)*d-28 = 0
-4/5*d-28 = 0 // + 28
-4/5*d = 28 // : -4/5
d = 28/(-4/5)
d = -35
d = -35
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