Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
A new edition Geometry book has 450 pages which are 230 pages less than twice as many pages as the old edition. How many pages did the old edition Geometry book have?

### Response:
 กำหนดให้ x เป็นจำนวนหน้าของหนังสือเล่ม Geometry เล่มเก่า
หนังสือเล่ม Geometry เล่มใหม่มี 2x - 230 = 450 หน้า
2x = 450 + 230
2x = 680
x = 680/2 = <<680/2=340>>340 หน้า