1. Let's first identify the problem: you have a sign error in your calculations. 2. A sign error means that either a plus (+) should be minus (−), or vice versa, in some part of your expression. 3. Carefully go through each step of your work and check operations where signs might have been changed incorrectly. 4. Look particularly at terms that involve subtraction or distributing negatives (for example, distributing a minus sign across parentheses). 5. If the error is in an equation, isolate the terms and verify if their signs comply with algebra rules. 6. Correct the signs accordingly and re-compute the affected parts. 7. Double-check your final answer by plugging back into the original equation if applicable. If you provide the exact equation or expression, I can help locate and fix the sign error precisely.