log(4) log(9)
(-oo, ------) U (1, ------]
log(7) log(7)
$$x\ in\ \left(-\infty, \frac{\log{\left(4 \right)}}{\log{\left(7 \right)}}\right) \cup \left(1, \frac{\log{\left(9 \right)}}{\log{\left(7 \right)}}\right]$$
x in Union(Interval.open(-oo, log(4)/log(7)), Interval.Lopen(1, log(9)/log(7)))
/ / log(9) \ log(4)\
Or|And|x <= ------, 1 < x|, x < ------|
\ \ log(7) / log(7)/
$$\left(x \leq \frac{\log{\left(9 \right)}}{\log{\left(7 \right)}} \wedge 1 < x\right) \vee x < \frac{\log{\left(4 \right)}}{\log{\left(7 \right)}}$$
(x < log(4)/log(7))∨((1 < x)∧(x <= log(9)/log(7)))