If $|4x+2|=10$ and $x<0$, what is the value of $x$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $|4x+2|=10$ and $x<0$, what is the value of $x$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-3
If $|4x+2|=10$ and $x<0$, what is the value of $x$?
train