Why not changing bases?

Algebra Level 5

If the real values of x which satisfy: $\frac{4}{\log_3 (x^2) -2} + \log_x (1/9) > 1$ are on the interval $X = \left]a,b\right[\ U \left]c, d\right[$ , find the value of $3a+b+c+d.$

Obs: a<b<c<d