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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
13/25 = (51/5)/x // - (51/5)/x
13/25-((51/5)/x) = 0
(-51/5)*x^-1+13/25 = 0
-51/5*x^-1 = -13/25 // : -51/5
x^-1 = 13/255
-1 < 0
1/(x^1) = 13/255 // * x^1
1 = 13/255*x^1 // : 13/255
255/13 = x^1
x = 255/13
x = 255/13
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