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