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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-10/x = -16/x-3 // + -16/x-3
3-10/x-(-16/x) = 0
16*x^-1-10/x+3 = 0
6*x^-1 = -3 // : 6
x^-1 = -1/2
-1 < 0
1/(x^1) = -1/2 // * x^1
1 = -1/2*x^1 // : -1/2
-2 = x^1
x = -2
x = -2
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