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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
200/26 = 130/x // - 130/x
200/26-(130/x) = 0
200/26-130*x^-1 = 0
-130*x^-1 = -100/13 // : -130
x^-1 = 10/169
-1 < 0
1/(x^1) = 10/169 // * x^1
1 = 10/169*x^1 // : 10/169
169/10 = x^1
x = 169/10
x = 169/10
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