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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-3 = 4 // - 4
10/x-4-3 = 0
10*x^-1 = 7 // : 10
x^-1 = 7/10
-1 < 0
1/(x^1) = 7/10 // * x^1
1 = 7/10*x^1 // : 7/10
10/7 = x^1
x = 10/7
x = 10/7
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