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D( x )
x = 0
4*x = 0
x = 0
x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
10/x = 5/(4*x)+1 // - 5/(4*x)+1
10/x-(5/(4*x))-1 = 0
10/x+(-5/4)*x^-1-1 = 0
35/4*x^-1 = 1 // : 35/4
x^-1 = 4/35
-1 < 0
1/(x^1) = 4/35 // * x^1
1 = 4/35*x^1 // : 4/35
35/4 = x^1
x = 35/4
x = 35/4
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