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d in (-oo:+oo)
(8/5)*d = 2/7 // - 2/7
(8/5)*d-(2/7) = 0
(8/5)*d-2/7 = 0
8/5*d-2/7 = 0 // + 2/7
8/5*d = 2/7 // : 8/5
d = 2/7/8/5
d = 5/28
d = 5/28
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