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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
13.3/6.2 = 6.7/x // - 6.7/x
13.3/6.2-(6.7/x) = 0
13.3/6.2-6.7*x^-1 = 0
-6.7*x^-1 = -2.14516129 // : -6.7
x^-1 = 0.32017333
-1 < 0
1/(x^1) = 0.32017333 // * x^1
1 = 0.32017333*x^1 // : 0.32017333
3.12330824 = x^1
x = 3.12330824
x = 3.12330824
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