26x^2+30x
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Expand the following expression: $(13x+15)\cdot 2x$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
26x^2+30x
Expand the following expression: $(13x+15)\cdot 2x$
train