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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5-(2/x) = 8 // - 8
5-(2/x)-8 = 0
5-2*x^-1-8 = 0
-2*x^-1 = 3 // : -2
x^-1 = -3/2
-1 < 0
1/(x^1) = -3/2 // * x^1
1 = -3/2*x^1 // : -3/2
-2/3 = x^1
x = -2/3
x = -2/3
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