To simplify the expression \( x675x453 \), we can interpret it as the double multiplication of the numbers represented by the letters and numbers:
\[ x675x453 = (x675) \times (x453) \]
However, without clear instructions or additional context about what to do with the 'x' and the numbers, the expression remains as is: \( x675x453 \).
If you meant to multiply the two expressions represented by \( x675 \) and \( x453 \) as two separate terms, we can treat 'x' as a variable and write:
\[ x675 \times x453 = (x \cdot 675) \times (x \cdot 453) = x^2 \cdot (675 \times 453) \]
Now we'll multiply \( 675 \) and \( 453 \):
\[ 675 \times 453 = 305775 \]
So the expression simplifies to:
\[ x^2 \cdot 305775 \]
Thus, the original expression \( x675x453 \) can be simplified to:
\[ 305775x^2 \]