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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
-x/(x^2)-169 = 0
-1*x^-1 = 169 // : -1
x^-1 = -169
-1 < 0
1/(x^1) = -169 // * x^1
1 = -169*x^1 // : -169
-1/169 = x^1
x = -1/169
x = -1/169
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