Solve: `4 | 2x+7 | -9 >= 27`

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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 reduced fraction (like 5/3, not 10/6) or as an integer (like 4 or -2)
Do not enter mixed numbers
Use oo to enter Infinity.
Decimal values are not allowed