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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8.9/2.5 = 7.9/n // - 7.9/n
8.9/2.5-(7.9/n) = 0
8.9/2.5-7.9*n^-1 = 0
-7.9*n^-1 = -3.56 // : -7.9
n^-1 = 0.45063291
-1 < 0
1/(n^1) = 0.45063291 // * n^1
1 = 0.45063291*n^1 // : 0.45063291
2.21910113 = n^1
n = 2.21910113
n = 2.21910113
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