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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8.1/x = 4.6 // - 4.6
8.1/x-4.6 = 0
8.1*x^-1 = 4.6 // : 8.1
x^-1 = 0.56790123
-1 < 0
1/(x^1) = 0.56790123 // * x^1
1 = 0.56790123*x^1 // : 0.56790123
1.76086958 = x^1
x = 1.76086958
x = 1.76086958
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