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d in (-oo:+oo)
6-((5/6)*d) = d+206/27 // - d+206/27
6-((5/6)*d)-d-(206/27) = 0
(-5/6)*d-d-206/27+6 = 0
-11/6*d-44/27 = 0 // + 44/27
-11/6*d = 44/27 // : -11/6
d = 44/27/(-11/6)
d = -8/9
d = -8/9
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