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D( d )
3*d-1 = 0
3*d-1 = 0
3*d-1 = 0
3*d-1 = 0 // + 1
3*d = 1 // : 3
d = 1/3
d in (-oo:1/3) U (1/3:+oo)
(5*d)/(3*d-1) = 17/10 // - 17/10
(5*d)/(3*d-1)-(17/10) = 0
(5*d)/(3*d-1)-17/10 = 0
(5*10*d)/(10*(3*d-1))+(-17*(3*d-1))/(10*(3*d-1)) = 0
5*10*d-17*(3*d-1) = 0
17-d = 0
(17-d)/(10*(3*d-1)) = 0
(17-d)/(10*(3*d-1)) = 0 // * 10*(3*d-1)
17-d = 0
17-d = 0 // - 17
-d = -17 // * -1
d = 17
d = 17
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