To simplify the fraction \( \frac{x675}{x453} \), we look for a common factor between the numerator and the denominator.
Both \(675\) and \(453\) are divisible by \(3\), so we can divide the numerator and the denominator by \(3\):
\[\frac{x675}{x453} = \frac{225x}{151x}\]
Now we can simplify by dividing \(225\) by \(151\):
\[\frac{x675}{x453} = \frac{225x}{151x} = \frac{15}{x}\]
Therefore, the simplified fraction is \( \frac{15}{x} \).