math
posted by Jennifer .
Jane is taking a class and asks you to help her figure out what her last grade must be in the class to get a 85 in the class. She tells you the following calculation is used to find your final grade:
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x is her last score which has not been taken. Explain this equation and the process you would use to solve for the unknown test score. Solve for the test score.
** could you please elaborate on how you came to the conclusion of the answer?
Thank you!

Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.
See your later post.