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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
7/j = 385/55 // - 385/55
7/j-(385/55) = 0
7/j-7 = 0
7*j^-1 = 7 // : 7
j^-1 = 1
-1 < 0
1/(j^1) = 1 // * j^1
1 = 1*j^1 // : 1
1 = j^1
j = 1
j = 1
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