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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X+1/x = 3/10 // - 3/10
X+1/x-(3/10) = 0
X+1/x-3/10 = 0
1*x^-1 = -(X-3/10) // : 1
x^-1 = 3/10-X
-1 < 0
1/(x^1) = 3/10-X // * x^1
1 = x^1*(3/10-X) // : 3/10-X
1/(3/10-X) = x^1
x = 1/(3/10-X)
x = 1/(3/10-X)
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