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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/7 = 48/n // - 48/n
4/7-(48/n) = 0
4/7-48*n^-1 = 0
-48*n^-1 = -4/7 // : -48
n^-1 = 1/84
-1 < 0
1/(n^1) = 1/84 // * n^1
1 = 1/84*n^1 // : 1/84
84 = n^1
n = 84
n = 84
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