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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
128/j = 7 // - 7
128/j-7 = 0
128*j^-1 = 7 // : 128
j^-1 = 7/128
-1 < 0
1/(j^1) = 7/128 // * j^1
1 = 7/128*j^1 // : 7/128
128/7 = j^1
j = 128/7
j = 128/7
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