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d in (-oo:+oo)
2/5 = (4/5)*d // - (4/5)*d
2/5-((4/5)*d) = 0
(-4/5)*d+2/5 = 0
2/5-4/5*d = 0 // - 2/5
-4/5*d = -2/5 // : -4/5
d = -2/5/(-4/5)
d = 1/2
d = 1/2
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