1. Let's first state the problem clearly: We need to explain problem 12 step by step in a clear and detailed manner. 2. Since the user did not provide the exact problem 12, I will assume it is a typical algebra problem involving solving an equation or simplifying an expression. 3. For example, if problem 12 is to solve the equation $$2x + 3 = 11$$, we proceed as follows: 4. Step 1: Subtract 3 from both sides to isolate the term with $x$: $$2x + 3 - 3 = 11 - 3$$ which simplifies to $$2x = 8$$ 5. Step 2: Divide both sides by 2 to solve for $x$: $$\frac{2x}{2} = \frac{8}{2}$$ which simplifies to $$x = 4$$ 6. Step 3: Check the solution by substituting $x=4$ back into the original equation: $$2(4) + 3 = 8 + 3 = 11$$ which is true, so $x=4$ is the correct solution. 7. This stepwise approach helps understand how to isolate the variable and solve the equation systematically. If you provide the exact problem 12, I can give a more precise explanation.