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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+5/x-11 = x+7/x-5 // - x+7/x-5
x-x+5/x-(7/x)-11+5 = 0
x-x+5/x-7*x^-1-11+5 = 0
-2*x^-1 = 6 // : -2
x^-1 = -3
-1 < 0
1/(x^1) = -3 // * x^1
1 = -3*x^1 // : -3
-1/3 = x^1
x = -1/3
x = -1/3
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