a=first number
b=second number
a+b=1000
a=1000-b
a-b=100
1000-b-b=100
1000-2b=100
1000-100=2b
2b=900 Divide with 2
b=450
a=1000-b
a=1000-450
a=550
a+b=550+450=1000
a-b=550-450=100
i am two numbers,
the sum of my numbers is 1000,
the diffrence between my two numbers is 100
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