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