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d in (-oo:+oo)
(-6/7)*d+5/7 = 23/7 // - 23/7
(-6/7)*d+5/7-(23/7) = 0
(-6/7)*d+5/7-23/7 = 0
-6/7*d-18/7 = 0 // + 18/7
-6/7*d = 18/7 // : -6/7
d = 18/7/(-6/7)
d = -3
d = -3
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