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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)
0.1-(x/(x^2)) = 1.34*10^10 // - 1.34*10^10
0.1-(x/(x^2))-(1.34*10^10) = 0
0.1-x^-1-1.34*10^10 = 0
-1*x^-1 = 13399999999.9 // : -1
x^-1 = -13399999999.9
-1 < 0
1/(x^1) = -13399999999.9 // * x^1
1 = -13399999999.9*x^1 // : -13399999999.9
0 = x^1
x = 0
x in { 0}
x belongs to the empty set
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