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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = 1.33 // - 1.33
10/x-1.33 = 0
10*x^-1 = 1.33 // : 10
x^-1 = 0.133
-1 < 0
1/(x^1) = 0.133 // * x^1
1 = 0.133*x^1 // : 0.133
7.51879699 = x^1
x = 7.51879699
x = 7.51879699
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