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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
3 = 33/j // - 33/j
3-(33/j) = 0
3-33*j^-1 = 0
-33*j^-1 = -3 // : -33
j^-1 = 1/11
-1 < 0
1/(j^1) = 1/11 // * j^1
1 = 1/11*j^1 // : 1/11
11 = j^1
j = 11
j = 11
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