Chris and Nathan order a giant cookie together. If Chris eats $\frac{2}{7}$ of the cookie and Nathan eats $\frac{3}{5}$ of the cookie, what fraction of the original cookie is left?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Chris and Nathan order a giant cookie together. If Chris eats $\frac{2}{7}$ of the cookie and Nathan eats $\frac{3}{5}$ of the cookie, what fraction of the original cookie is left?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\frac{4}{35}
Chris and Nathan order a giant cookie together. If Chris eats $\frac{2}{7}$ of the cookie and Nathan eats $\frac{3}{5}$ of the cookie, what fraction of the original cookie is left?
train