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d in (-oo:+oo)
8-((6/7)*d) = 51/7 // - 51/7
8-((6/7)*d)-(51/7) = 0
(-6/7)*d-51/7+8 = 0
5/7-6/7*d = 0 // - 5/7
-6/7*d = -5/7 // : -6/7
d = -5/7/(-6/7)
d = 5/6
d = 5/6
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