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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
12/j = 24/36 // - 24/36
12/j-(24/36) = 0
12/j-2/3 = 0
12*j^-1 = 2/3 // : 12
j^-1 = 1/18
-1 < 0
1/(j^1) = 1/18 // * j^1
1 = 1/18*j^1 // : 1/18
18 = j^1
j = 18
j = 18
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