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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(4/5) = 6/x-7 // - 6/x-7
X-(6/x)-(4/5)+7 = 0
X-6*x^-1-4/5+7 = 0
-6*x^-1 = -(X+31/5) // : -6
x^-1 = (X+31/5)/6
-1 < 0
1/(x^1) = (X+31/5)/6 // * x^1
1 = x^1*((X+31/5)/6) // : (X+31/5)/6
6*(X+31/5)^-1 = x^1
x = 6*(X+31/5)^-1
x = 6*(X+31/5)^-1
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