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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
2/j+3 = 4/5 // - 4/5
2/j-(4/5)+3 = 0
2/j-4/5+3 = 0
2*j^-1 = -11/5 // : 2
j^-1 = -11/10
-1 < 0
1/(j^1) = -11/10 // * j^1
1 = -11/10*j^1 // : -11/10
-10/11 = j^1
j = -10/11
j = -10/11
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