What you must do for this case is to solve both inequalities
We have then:
18x-9> 9
We clear x:
18x> 9 + 9
x> 18/18
x> 1
2x-4> -10
We clear x:
2x> -10 + 4
x> -6/2
x> -3
Therefore we have to
For 2x> -10 + 4
x belongs (-3, inf)
For 18x> 9 + 9
x belongs (1, inf)
The solution that is met for both inequalities is:x belongs (1, inf)