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D( n )
n-4 = 0
n = 0
n-4 = 0
n-4 = 0
n-4 = 0 // + 4
n = 4
n = 0
n = 0
n in (-oo:0) U (0:4) U (4:+oo)
2/n = 3/(n-4) // - 3/(n-4)
2/n-(3/(n-4)) = 0
2/n-3*(n-4)^-1 = 0
2/n-3/(n-4) = 0
(-3*n)/(n*(n-4))+(2*(n-4))/(n*(n-4)) = 0
2*(n-4)-3*n = 0
-n-8 = 0
(-n-8)/(n*(n-4)) = 0
(-n-8)/(n*(n-4)) = 0 // * n*(n-4)
-n-8 = 0
-n-8 = 0 // + 8
-n = 8 // * -1
n = -8
n = -8
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