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d in (-oo:+oo)
(2/7)*d-5/7 = 1 // - 1
(2/7)*d-5/7-1 = 0
2/7*d-12/7 = 0 // + 12/7
2/7*d = 12/7 // : 2/7
d = 12/7/2/7
d = 6
d = 6
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