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d in (-oo:+oo)
35/21 = d/3 // - d/3
35/21-(d/3) = 0
5/3-1/3*d = 0 // - 5/3
-1/3*d = -5/3 // : -1/3
d = -5/3/(-1/3)
d = 5
d = 5
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