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3 and 10
The sum of 3 and 10 is 13
The difference of 3 and 10 is 7
Using algebraic notation, if the two numbers are x and y:
x + y = 13
x - y = 7
If you add these two equations you get
2x = 20 so x = 10
Substituting this back into the original equations you find that y must then be 3
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