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