If $3a + b + c = -3, a+3b+c = 9, a+b+3c = 19$, then find $abc$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $3a + b + c = -3, a+3b+c = 9, a+b+3c = 19$, then find $abc$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-56
If $3a + b + c = -3, a+3b+c = 9, a+b+3c = 19$, then find $abc$.
train