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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/n-(7/n)-2+7 = 0
4/n-7*n^-1-2+7 = 0
-3*n^-1 = -5 // : -3
n^-1 = 5/3
-1 < 0
1/(n^1) = 5/3 // * n^1
1 = 5/3*n^1 // : 5/3
3/5 = n^1
n = 3/5
n = 3/5
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