Help I don't understand how to do this one pls

What are the following algebraic equations. you need to post those if you want the answer

put like terms together.orremember that the 45 becomes negative when moved to the other side.orthe minuses cancel out.

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?