1. The problem is about solving an equation and understanding the operations allowed on both sides. 2. When solving equations, the key rule is to perform the same operation on both sides to keep the equality true. 3. If you subtract 2 from one side, you must subtract 2 from the other side as well. 4. Subtracting only -13 (which is adding 13) from one side and not the other changes the balance and the equation becomes incorrect. 5. Therefore, it is impossible to solve the equation correctly if you subtract only -13 from one side without doing the same to the other side. 6. Always perform the same operation on both sides to maintain equality and solve the equation correctly.