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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.5 = 25.7-(4.5/x) // - 25.7-(4.5/x)
4.5/x-25.7+3.5 = 0
4.5*x^-1 = 22.2 // : 4.5
x^-1 = 4.93333333
-1 < 0
1/(x^1) = 4.93333333 // * x^1
1 = 4.93333333*x^1 // : 4.93333333
0.2027027 = x^1
x = 0.2027027
x = 0.2027027
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