If a certain number is multiplied by five, the result is the  same as twenty-one plus twice the original number.  What is the value of the original number?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If a certain number is multiplied by five, the result is the  same as twenty-one plus twice the original number.  What is the value of the original number?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
7
If a certain number is multiplied by five, the result is the  same as twenty-one plus twice the original number.  What is the value of the original number?
train