13
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $3m+4n=47$, and $m+n=15$, what is $m$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
13
If $3m+4n=47$, and $m+n=15$, what is $m$?
train