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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
9/2 = 27/j // - 27/j
9/2-(27/j) = 0
9/2-27*j^-1 = 0
-27*j^-1 = -9/2 // : -27
j^-1 = 1/6
-1 < 0
1/(j^1) = 1/6 // * j^1
1 = 1/6*j^1 // : 1/6
6 = j^1
j = 6
j = 6
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