The side lengths of a right triangle measure $x$, $x + y$ and $x - y$ units where $0 < y < x$. What is the value of $y \div x$? Express your answer as a common fraction.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
The side lengths of a right triangle measure $x$, $x + y$ and $x - y$ units where $0 < y < x$. What is the value of $y \div x$? Express your answer as a common fraction.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\frac{1}{4}
The side lengths of a right triangle measure $x$, $x + y$ and $x - y$ units where $0 < y < x$. What is the value of $y \div x$? Express your answer as a common fraction.
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