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d in (-oo:+oo)
5/10 = d/20 // - d/20
5/10-(d/20) = 0
1/2-1/20*d = 0 // - 1/2
-1/20*d = -1/2 // : -1/20
d = -1/2/(-1/20)
d = 10
d = 10
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