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

### Instruction:
Derek has $40. He spends $14 on lunch for himself, $11 for lunch for his dad, and $5 on more lunch for himself. His brother Dave has $50 and only spends $7 on lunch for his mom. How much more money does Dave have left than Derek?

### Response:
 เดริคมีเงิน 40-14-11-5 = <<40-14-11-5=10>>10 เหรียญ
เดฟมีเงิน 50-7 = <<50-7=43>>43 เหรียญ
เดฟมีเงินเหลือมากกว่าเดริค 33 เหรียญ