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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = (2/10)/x-2+2+2 // - (2/10)/x-2+2+2
2/x-((2/10)/x)-2-2+2 = 0
2/x+(-1/5)*x^-1-2-2+2 = 0
9/5*x^-1 = 2 // : 9/5
x^-1 = 10/9
-1 < 0
1/(x^1) = 10/9 // * x^1
1 = 10/9*x^1 // : 10/9
9/10 = x^1
x = 9/10
x = 9/10
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