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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.4/x = 5.1 // - 5.1
3.4/x-5.1 = 0
3.4*x^-1 = 5.1 // : 3.4
x^-1 = 1.5
-1 < 0
1/(x^1) = 1.5 // * x^1
1 = 1.5*x^1 // : 1.5
0.66666667 = x^1
x = 0.66666667
x = 0.66666667
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