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d in (-oo:+oo)
6/11 = d/7 // - d/7
6/11-(d/7) = 0
6/11-1/7*d = 0 // - 6/11
-1/7*d = -6/11 // : -1/7
d = -6/11/(-1/7)
d = 42/11
d = 42/11
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