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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/x+1/2+1 = 2-2/x // - 2-2/x
X/x-(-2/x)+1/2-2+1 = 0
X/x+2*x^-1+1/2-2+1 = 0
X*x^-1+2*x^-1-1/2 = 0
t_1 = x^-1
X*t_1^1+2*t_1^1-1/2 = 0
2*t_1-1/2 = 0 // + 1/2
2*t_1 = 1/2 // : 2
t_1 = 1/2/2
t_1 = 1/4
t_1 = 1/4
x^-1-1/4 = 0
1*x^-1 = 1/4 // : 1
x^-1 = 1/4
-1 < 0
1/(x^1) = 1/4 // * x^1
1 = 1/4*x^1 // : 1/4
4 = x^1
x = 4
x = 4
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