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

### Instruction:
There are 3 meatballs on each spaghetti plate.  If Theresa's 3 sons each eat two-thirds of the meatballs on their respective plates, how many meatballs are still left on their plates altogether?

### Response:
This is how many meatballs are on the plates in total 3 x 3 = <<3*3=9>>9 meatballs.
This is how many meatballs are eaten 2/3 x 9 = <<2/3*9=6>>6 meatballs.
This is how many meatballs are left 9 - 6 = <<9-6=3>>3 meatballs.
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