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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 8/36.44 // - 8/36.44
4/x-(8/36.44) = 0
4/x-0.21953897 = 0
4*x^-1 = 0.21953897 // : 4
x^-1 = 0.05488474
-1 < 0
1/(x^1) = 0.05488474 // * x^1
1 = 0.05488474*x^1 // : 0.05488474
18.22000068 = x^1
x = 18.22000068
x = 18.22000068
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