Solve the inequality: `9 - 9 x >= 15 - 8 x`

Enter your answer as an interval, such as `[a,oo)`. Use oo (two lower case o's) to represent an infinity sign.

Box 1: Enter your answer using interval notation. Example: [2,5)
Use U for union to combine intervals. Example: (-oo,2] U [4,oo)
Enter each value as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for an empty set. Use oo to enter Infinity.