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d in (-oo:+oo)
(2/7)*d = 8/15 // - 8/15
(2/7)*d-(8/15) = 0
(2/7)*d-8/15 = 0
2/7*d-8/15 = 0 // + 8/15
2/7*d = 8/15 // : 2/7
d = 8/15/2/7
d = 28/15
d = 28/15
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