What is the value of $x + y + z$ when $6x + 5y - 2z = -4$ and $4x + 5y + 12z = 54$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
What is the value of $x + y + z$ when $6x + 5y - 2z = -4$ and $4x + 5y + 12z = 54$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
What is the value of $x + y + z$ when $6x + 5y - 2z = -4$ and $4x + 5y + 12z = 54$?
train