1. The problem is to solve the equation $2x = 4$ for $x$. 2. The formula used here is to isolate $x$ by dividing both sides of the equation by the coefficient of $x$, which is 2. 3. Dividing both sides by 2 gives: $$\frac{2x}{\cancel{2}} = \frac{4}{\cancel{2}}$$ 4. Simplifying the division, we get: $$x = 2$$ 5. Therefore, the solution to the equation $2x = 4$ is $x = 2$.