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

### Instruction:
A quarterback throws 50 passes in one game.  He throws twice as many passes to the right of the field than he does to the left of the field.  He throws 2 more passes to the center of the field than he did to the left.  How many passes did he throw to the left side of the field?

### Response:
 ให้ x เป็นจำนวนลูกที่โยนไปทางซ้ายของสนาม
ทางขวา: 2x
ทางกลาง: x+2
รวม: x+2x+x+2=50
4x=50
x=<<12.5=12.5>>12.5 ลูก