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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.6/x = 28.66 // - 28.66
5.6/x-28.66 = 0
5.6*x^-1 = 28.66 // : 5.6
x^-1 = 5.11785714
-1 < 0
1/(x^1) = 5.11785714 // * x^1
1 = 5.11785714*x^1 // : 5.11785714
0.19539428 = x^1
x = 0.19539428
x = 0.19539428
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