the difference 20 and sum 0f 6
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I assume you mean the sum of two numbers is 20 and the difference is 6
x+y=20
x-y=6
Add y to both sides
x=y+6
substitute into first equation
y+6+y=20
2y+6=20
Subtract 6 from both sides
2y=14
y=7
Since x+y=20
x+7=20
x=13
To check
13+7=20
13-7=6
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