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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/18 = 2/x-4 // - 2/x-4
3/18-(2/x)+4 = 0
3/18-2*x^-1+4 = 0
-2*x^-1 = -25/6 // : -2
x^-1 = 25/12
-1 < 0
1/(x^1) = 25/12 // * x^1
1 = 25/12*x^1 // : 25/12
12/25 = x^1
x = 12/25
x = 12/25
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