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d in (-oo:+oo)
9/10 = d/6 // - d/6
9/10-(d/6) = 0
9/10-1/6*d = 0 // - 9/10
-1/6*d = -9/10 // : -1/6
d = -9/10/(-1/6)
d = 27/5
d = 27/5
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