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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18.3/x = 6.1 // - 6.1
18.3/x-6.1 = 0
18.3*x^-1 = 6.1 // : 18.3
x^-1 = 0.33333333
-1 < 0
1/(x^1) = 0.33333333 // * x^1
1 = 0.33333333*x^1 // : 0.33333333
3.00000003 = x^1
x = 3.00000003
x = 3.00000003
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