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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(2/x)-5 = x+6/x-7 // - x+6/x-7
x-x-(2/x)-(6/x)-5+7 = 0
x-x-2*x^-1-6*x^-1-5+7 = 0
-8*x^-1 = -2 // : -8
x^-1 = 1/4
-1 < 0
1/(x^1) = 1/4 // * x^1
1 = 1/4*x^1 // : 1/4
4 = x^1
x = 4
x = 4
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