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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
30/j = 26/29 // - 26/29
30/j-(26/29) = 0
30/j-26/29 = 0
30*j^-1 = 26/29 // : 30
j^-1 = 13/435
-1 < 0
1/(j^1) = 13/435 // * j^1
1 = 13/435*j^1 // : 13/435
435/13 = j^1
j = 435/13
j = 435/13
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