The expression can be simplified to: 7x+4y
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There are 3 terms in the algebraic expression of: 3y+9+7x
5x+2x-3y+y = (5+2)x+(-3+1)y = 7x - 2y
Unfortunately, the browser used by Answers.com for posting questions is incapable of accepting mathematical symbols. This means that we cannot see the mathematically critical parts of the question. We are, therefore unable to determine what exactly the question is about and so cannot give a proper answer to your question.If the equation was 7x = 3y-8 then the answer is 8/3
7x + 3y=63
-7x + 6 + 7x - 2 = 4