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d in (-oo:+oo)
(6/7)*d-(1/2) = 5/14 // - 5/14
(6/7)*d-(1/2)-(5/14) = 0
(6/7)*d-1/2-5/14 = 0
6/7*d-6/7 = 0 // + 6/7
6/7*d = 6/7 // : 6/7
d = 6/7/6/7
d = 1
d = 1
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