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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
5.68/j = 0.71 // - 0.71
5.68/j-0.71 = 0
5.68*j^-1 = 0.71 // : 5.68
j^-1 = 0.125
-1 < 0
1/(j^1) = 0.125 // * j^1
1 = 0.125*j^1 // : 0.125
8 = j^1
j = 8
j = 8
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