You can put this solution on YOUR website! -12 less than or equal to 4x-18< 7
add 18 to both sides
6 less than or equal to 4x < 25
divide both sides by 4
3/2 less than or equal to x < 25/4
and the interval solution for x is
[3/2, 25/4)
note that the interval is closed on the left and open on the right