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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/x-1+2 = 5/4 // - 5/4
1/x+1/x-(5/4)-1+2 = 0
1/x+1/x-5/4-1+2 = 0
2*x^-1 = 1/4 // : 2
x^-1 = 1/8
-1 < 0
1/(x^1) = 1/8 // * x^1
1 = 1/8*x^1 // : 1/8
8 = x^1
x = 8
x = 8
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