1. The problem is to work with a number represented by $x$ instead of $W$. 2. This means wherever the variable $W$ was used, we now replace it with $x$. 3. For example, if an equation was $W + 3 = 7$, it becomes $x + 3 = 7$. 4. To solve for $x$, subtract 3 from both sides: $$x = 7 - 3$$ 5. Simplify the right side: $$x = 4$$ 6. So, the value of $x$ is 4. 7. This substitution does not change the problem's nature, only the variable name. 8. Always ensure to consistently use $x$ throughout the problem once the substitution is made.