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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 1.6 // - 1.6
6/x-1.6 = 0
6*x^-1 = 1.6 // : 6
x^-1 = 0.26666667
-1 < 0
1/(x^1) = 0.26666667 // * x^1
1 = 0.26666667*x^1 // : 0.26666667
3.74999995 = x^1
x = 3.74999995
x = 3.74999995
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