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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
170/116 = 260/x // - 260/x
170/116-(260/x) = 0
170/116-260*x^-1 = 0
-260*x^-1 = -85/58 // : -260
x^-1 = 17/3016
-1 < 0
1/(x^1) = 17/3016 // * x^1
1 = 17/3016*x^1 // : 17/3016
3016/17 = x^1
x = 3016/17
x = 3016/17
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