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D( j )
j-(5/10) = 0
j-(5/10) = 0
j-(5/10) = 0
j-1/2 = 0
j-1/2 = 0 // + 1/2
j = 1/2
j in (-oo:1/2) U (1/2:+oo)
(5-(j/16))/(j-(5/10)) = 0
(5-(j/16))/(j-1/2) = 0
(5-1/16*j)/(j-1/2) = 0
5-1/16*j = 0 // - 5
-1/16*j = -5 // : -1/16
j = -5/(-1/16)
j = 80
j = 80
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