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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
-48/j = 6 // - 6
-48/j-6 = 0
-48*j^-1 = 6 // : -48
j^-1 = -1/8
-1 < 0
1/(j^1) = -1/8 // * j^1
1 = -1/8*j^1 // : -1/8
-8 = j^1
j = -8
j = -8
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