From the book

"Why is the following way to simplify the fraction 17/75 incorrect?"

$\displaystyle \frac{1\not7}{\not75}=\frac{1}{5}$

My answer

This is an incorrect way to simplify the fraction because 17/75 cannot be simplified any further by dividing out digits within whole numbers in the numerator and denominator.

Do you think this clear and correct?