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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-5-2 = -3/x // + -3/x
10/x-(-3/x)-5-2 = 0
10/x+3*x^-1-5-2 = 0
13*x^-1 = 7 // : 13
x^-1 = 7/13
-1 < 0
1/(x^1) = 7/13 // * x^1
1 = 7/13*x^1 // : 7/13
13/7 = x^1
x = 13/7
x = 13/7
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