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D( x )
8*n^2*x = 0
8*n^2*x = 0
8*n^2*x = 0
8*n^2*x = 0 // : 8*n^2
x = 0
x in (-oo:0) U (0:+oo)
(((10*n^2)/(8*n^2*x))*(6*n-60))/3 = 0
(5/4*x^-1*(6*n-60))/3 = 0
5/4*x^-1 = 0 // : 5/4
x^-1 = 0
x należy do O
x belongs to the empty set
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