SOLUTION: The sum of 2 numbers is 21 the difference of the two numbers?

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Question 983834: The sum of 2 numbers is 21 the difference of the two numbers?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
The sum of 2 numbers is 21 the difference of the two numbers?
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x + y = 21
x - y = 21 - 2y