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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x-2 = 2.5 // - 2.5
5/x-2.5-2 = 0
5*x^-1 = 4.5 // : 5
x^-1 = 0.9
-1 < 0
1/(x^1) = 0.9 // * x^1
1 = 0.9*x^1 // : 0.9
1.11111111 = x^1
x = 1.11111111
x = 1.11111111
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