To simplify the expression \(\frac{x^{675}}{x^{453}}\), you can use the properties of exponents. Specifically, when dividing like bases, you subtract the exponents:
\[ \frac{x^a}{x^b} = x^{a - b} \]
Applying this to your expression:
\[ \frac{x^{675}}{x^{453}} = x^{675 - 453} = x^{222} \]
Thus, the simplified form is:
\[ \boxed{x^{222}} \]