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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
28.56/x = 0.53 // - 0.53
28.56/x-0.53 = 0
28.56*x^-1 = 0.53 // : 28.56
x^-1 = 0.01855742
-1 < 0
1/(x^1) = 0.01855742 // * x^1
1 = 0.01855742*x^1 // : 0.01855742
53.88680107 = x^1
x = 53.88680107
x = 53.88680107
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