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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
30/j = 26/39 // - 26/39
30/j-(26/39) = 0
30/j-2/3 = 0
30*j^-1 = 2/3 // : 30
j^-1 = 1/45
-1 < 0
1/(j^1) = 1/45 // * j^1
1 = 1/45*j^1 // : 1/45
45 = j^1
j = 45
j = 45
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