7,5x+y-8, 5x-3, 5y

To prepare for university exams, it is important to understand and review the given expressions. Let's simplify and analyze each expression one by one.

1. 7,5x + y - 8: This expression consists of three terms: 7.5x, y, and -8. There isn't much simplification that can be done without additional information or equations.

2. 5x - 3: This expression consists of two terms: 5x and -3. It is already in simplified form.

3. 5y: This expression consists of one term: 5y. It is already in simplified form.

To further prepare for your university exams, it would be helpful to practice solving equations and manipulating expressions. Review any relevant concepts, such as factoring, simplifying algebraic expressions, and solving linear equations. Additionally, be sure to understand and apply any applicable rules or properties of algebra. Practice problems and past exams can be valuable resources in your preparation process. Good luck with your exams!