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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = (1/5)*n-n+(1/5)*n // - (1/5)*n-n+(1/5)*n
n-((1/5)*n)-((1/5)*n)+1/x = 0
(-1/5)*n+n+(-1/5)*n+1/x = 0
1*x^-1 = -(3/5*n) // : 1
x^-1 = -3/5*n
-1 < 0
1/(x^1) = -3/5*n // * x^1
1 = -3/5*n*x^1 // : -3/5*n
-5/3*n^-1 = x^1
x = -5/3*n^-1
x = -5/3*n^-1
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