If $x$ is a real number, find $x^2+2x(5-x)+(5-x)^2$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $x$ is a real number, find $x^2+2x(5-x)+(5-x)^2$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
25
If $x$ is a real number, find $x^2+2x(5-x)+(5-x)^2$.
train