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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
520/x = 40*n // - 40*n
520/x-(40*n) = 0
520/x-40*n = 0
520*x^-1 = -(-40*n) // : 520
x^-1 = n/13
-1 < 0
1/(x^1) = n/13 // * x^1
1 = (n/13)*x^1 // : n/13
13*n^-1 = x^1
x = 13*n^-1
x = 13*n^-1
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