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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
1/j = 69/345 // - 69/345
1/j-(69/345) = 0
1/j-1/5 = 0
1*j^-1 = 1/5 // : 1
j^-1 = 1/5
-1 < 0
1/(j^1) = 1/5 // * j^1
1 = 1/5*j^1 // : 1/5
5 = j^1
j = 5
j = 5
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