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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.543/x = 0.985 // - 0.985
0.543/x-0.985 = 0
0.543*x^-1 = 0.985 // : 0.543
x^-1 = 1.81399632
-1 < 0
1/(x^1) = 1.81399632 // * x^1
1 = 1.81399632*x^1 // : 1.81399632
0.55126903 = x^1
x = 0.55126903
x = 0.55126903
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