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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
36/j = 7/20 // - 7/20
36/j-(7/20) = 0
36/j-7/20 = 0
36*j^-1 = 7/20 // : 36
j^-1 = 7/720
-1 < 0
1/(j^1) = 7/720 // * j^1
1 = 7/720*j^1 // : 7/720
720/7 = j^1
j = 720/7
j = 720/7
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