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D( n )
2*n = 0
2*n = 0
2*n = 0
2*n = 0 // : 2
n = 0
n in (-oo:0) U (0:+oo)
4.3/25.8 = 1/(2*n) // - 1/(2*n)
4.3/25.8-(1/(2*n)) = 0
(-1/2)*n^-1+4.3/25.8 = 0
-1/2*n^-1 = -0.16666667 // : -1/2
n^-1 = 0.33333334
-1 < 0
1/(n^1) = 0.33333334 // * n^1
1 = 0.33333334*n^1 // : 0.33333334
2.99999994 = n^1
n = 2.99999994
n = 2.99999994
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