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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x+x/x-2-2 = 10 // - 10
4/x+x/x-10-2-2 = 0
4*x^-1 = 13 // : 4
x^-1 = 13/4
-1 < 0
1/(x^1) = 13/4 // * x^1
1 = 13/4*x^1 // : 13/4
4/13 = x^1
x = 4/13
x = 4/13
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