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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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7y ago

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