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d in (-oo:+oo)
(6/7)*d-(5/9) = 289/63 // - 289/63
(6/7)*d-(5/9)-(289/63) = 0
(6/7)*d-5/9-289/63 = 0
6/7*d-36/7 = 0 // + 36/7
6/7*d = 36/7 // : 6/7
d = 36/7/6/7
d = 6
d = 6
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