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d in (-oo:+oo)
(6/7)*d+6 = 18/7 // - 18/7
(6/7)*d-(18/7)+6 = 0
(6/7)*d-18/7+6 = 0
6/7*d+24/7 = 0 // - 24/7
6/7*d = -24/7 // : 6/7
d = -24/7/6/7
d = -4
d = -4
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