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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = 3.48 // - 3.48
10/x-3.48 = 0
10*x^-1 = 3.48 // : 10
x^-1 = 0.348
-1 < 0
1/(x^1) = 0.348 // * x^1
1 = 0.348*x^1 // : 0.348
2.87356322 = x^1
x = 2.87356322
x = 2.87356322
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