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d in (-oo:+oo)
6-(3*d) = 51/11 // - 51/11
6-(3*d)-(51/11) = 0
6-3*d-51/11 = 0
15/11-3*d = 0 // - 15/11
-3*d = -15/11 // : -3
d = -15/11/(-3)
d = 5/11
d = 5/11
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