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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(6/x)+8 = 4/7 // - 4/7
X-(6/x)-(4/7)+8 = 0
X-6*x^-1-4/7+8 = 0
-6*x^-1 = -(X+52/7) // : -6
x^-1 = (X+52/7)/6
-1 < 0
1/(x^1) = (X+52/7)/6 // * x^1
1 = x^1*((X+52/7)/6) // : (X+52/7)/6
6*(X+52/7)^-1 = x^1
x = 6*(X+52/7)^-1
x = 6*(X+52/7)^-1
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