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