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d in (-oo:+oo)
(2/5)*d+7 = 29/5 // - 29/5
(2/5)*d-(29/5)+7 = 0
(2/5)*d-29/5+7 = 0
2/5*d+6/5 = 0 // - 6/5
2/5*d = -6/5 // : 2/5
d = -6/5/2/5
d = -3
d = -3
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