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