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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2.6/n = 7.8/1.5 // - 7.8/1.5
2.6/n-(7.8/1.5) = 0
2.6/n-5.2 = 0
2.6*n^-1 = 5.2 // : 2.6
n^-1 = 2
-1 < 0
1/(n^1) = 2 // * n^1
1 = 2*n^1 // : 2
1/2 = n^1
n = 1/2
n = 1/2
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