1. The problem asks to solve for the first option among a, b, c, or d. Since no specific problem statement or options are given, I will demonstrate how to solve a typical algebraic problem involving options a, b, c, and d. 2. Suppose the problem is: Solve for $x$ in the equation $2x + 3 = 7$. 3. The formula used is to isolate $x$ by performing inverse operations. 4. Step 1: Subtract 3 from both sides: $$2x + 3 - 3 = 7 - 3$$ $$2x = 4$$ 5. Step 2: Divide both sides by 2: $$\frac{\cancel{2}x}{\cancel{2}} = \frac{4}{2}$$ $$x = 2$$ 6. The solution is $x = 2$. 7. This means the value of $x$ that satisfies the equation is 2. Since the user asked for the first one a, b, c, or d without specifying the problem, this is a general example of solving the first option.