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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-5 = 6/x+4 // - 6/x+4
2/x-(6/x)-5-4 = 0
2/x-6*x^-1-5-4 = 0
-4*x^-1 = 9 // : -4
x^-1 = -9/4
-1 < 0
1/(x^1) = -9/4 // * x^1
1 = -9/4*x^1 // : -9/4
-4/9 = x^1
x = -4/9
x = -4/9
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