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You would use two equations to solve this. First, you would note that x+y=3 and that 3-x=1. Adding the two equations together, you get an equation of 2x=4. Divide both sides by 2 and you get that x=2. take the first equation, x+y=3 and plug the 2 in for x, getting 2+y=3. Subtract 2 from both sides, and you get y=1. Take the second equation and plug in your x and y values getting 3-2=1. Since both statements (2+1=3 and 3-2=1) are true. you have found your solution.

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Q: The sum of two numbers is 3 their differences one find the numbers?
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