1. The problem is to solve number 10, but since the exact problem statement is not provided, I will assume a common algebraic problem for demonstration: Solve for $x$ in the equation $2x + 3 = 11$. 2. The formula used here is to isolate $x$ by performing inverse operations. Important rules: addition/subtraction and multiplication/division must be done on both sides of the equation to maintain equality. 3. Start by subtracting 3 from both sides: $$2x + 3 - \cancel{3} = 11 - \cancel{3}$$ which simplifies to $$2x = 8$$ 4. Next, divide both sides by 2 to solve for $x$: $$\frac{2x}{\cancel{2}} = \frac{8}{\cancel{2}}$$ which simplifies to $$x = 4$$ 5. Therefore, the solution is $x = 4$. This step-by-step approach shows how to isolate the variable by performing inverse operations on both sides of the equation.