1. The problem is to solve the equation or expression given by the user, but since no specific equation was provided, let's assume a simple example: solve $2x + 3 = 7$. 2. The formula or rule to solve for $x$ in a linear equation like this is to isolate $x$ on one side of the equation by performing inverse operations. 3. Start by subtracting 3 from both sides: $$2x + 3 - 3 = 7 - 3$$ which simplifies to $$2x = 4$$ 4. Next, divide both sides by 2 to solve for $x$: $$\frac{\cancel{2}x}{\cancel{2}} = \frac{4}{2}$$ which simplifies to $$x = 2$$ 5. So, the solution is $x = 2$. This means if you substitute $2$ back into the original equation, it will satisfy it: $2(2) + 3 = 4 + 3 = 7$. This is how you solve a simple linear equation step-by-step.