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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
19/j = 18 // - 18
19/j-18 = 0
19*j^-1 = 18 // : 19
j^-1 = 18/19
-1 < 0
1/(j^1) = 18/19 // * j^1
1 = 18/19*j^1 // : 18/19
19/18 = j^1
j = 19/18
j = 19/18
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