exam Maths Puzzle Numerical Ability

Hello, I am not sure if I am in the right area for this question...if not please direct me on what this problem is called (that is my main problem, not sure how to categorize it).

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What is -3(2y - 9) + y simplified? I have to do a really big project and I got stuck doing this. I do not know what is means. What is an algebraic expression using equations and inequalities? Will you give me examples of each.