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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-2/(-10) = -5/x // + -5/x
-(-5/x)-2/(-10) = 0
5*x^-1-2/(-10) = 0
5*x^-1 = -1/5 // : 5
x^-1 = -1/25
-1 < 0
1/(x^1) = -1/25 // * x^1
1 = -1/25*x^1 // : -1/25
-25 = x^1
x = -25
x = -25
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