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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.01/4.02 = 6/x // - 6/x
2.01/4.02-(6/x) = 0
2.01/4.02-6*x^-1 = 0
-6*x^-1 = -0.5 // : -6
x^-1 = 0.08333333
-1 < 0
1/(x^1) = 0.08333333 // * x^1
1 = 0.08333333*x^1 // : 0.08333333
12.00000048 = x^1
x = 12.00000048
x = 12.00000048
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