1. The problem is to solve the first question from Class 7, Chapter 7, Exercise 7a, which typically involves algebraic expressions or equations. 2. Since the exact question is not provided, let's consider a common type of problem from such exercises: simplifying an algebraic expression or solving a linear equation. 3. For example, if the problem is to solve the equation $2x + 3 = 11$: - Use the formula for solving linear equations: isolate the variable $x$ by performing inverse operations. 4. Step-by-step solution: 1. Start with the equation: $2x + 3 = 11$ 2. Subtract 3 from both sides: $2x + 3 - 3 = 11 - 3$ 3. Simplify: $2x = 8$ 4. Divide both sides by 2: $\frac{2x}{2} = \frac{8}{2}$ 5. Simplify: $x = 4$ 5. Therefore, the solution to the equation is $x = 4$. This method applies to many linear equations: isolate the variable by performing inverse operations step-by-step. If you provide the exact question, I can solve it specifically.