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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
-12/j = 4 // - 4
-12/j-4 = 0
-12*j^-1 = 4 // : -12
j^-1 = -1/3
-1 < 0
1/(j^1) = -1/3 // * j^1
1 = -1/3*j^1 // : -1/3
-3 = j^1
j = -3
j = -3
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