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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-4+3 = x/x-4 // - x/x-4
10/x-(x/x)-4+3+4 = 0
10/x-4-1+3+4 = 0
10*x^-1 = -2 // : 10
x^-1 = -1/5
-1 < 0
1/(x^1) = -1/5 // * x^1
1 = -1/5*x^1 // : -1/5
-5 = x^1
x = -5
x = -5
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