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The idea here is to add everything to the left side of both equations together, and everything on the right side. So, you get:

x + y + 8 - x = 8 + 7

After simplifying, in this case you eliminate one variable, which is the purpose of this method. After solving for this variable, you can replace its value in any of the original equations to get the other variable.

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Q: Solve this equation using addition method x plus y equals 8 and -x plus 2y equals 7?
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