1. The problem involves identifying and correcting sign errors in given equations used as examples in math problems. 2. When you don’t have a full circuit diagram or extra context, focus on consistent application of sign rules based on the problem conditions. 3. Carefully check each step where you assign signs to voltages, currents, or variables to verify alignment with the defined reference directions or conventions. 4. Double-check all algebraic manipulations that include adding or subtracting terms, as sign mistakes often occur during simplification. 5. If 2 out of 3 equations are showing incorrect signs, re-examine those specific steps and compare processes between correct and incorrect cases to spot where signs flipped unexpectedly. 6. Correcting sign errors can also involve reviewing the initial assumptions or directions given and ensuring they match throughout the work. 7. Without additional context like diagrams, rely on logical consistency, detailed checking, and re-computation to resolve sign-related errors in math questions. Final answer: To correct sign errors without extra information, meticulously verify reference directions, carefully review algebraic steps, and maintain consistent sign conventions throughout your work.