1. The problem asks for the formula of $x$. 2. To find the formula for $x$, we need an equation or context relating $x$ to other variables or constants. 3. Without additional information or an equation, $x$ is typically considered a variable and does not have a single formula. 4. If you provide an equation or context, I can help solve for $x$ explicitly. In summary, the formula for $x$ depends on the problem or equation given. Please provide more details to find $x$.