Solve for a
a=10-b
Solve for b
b=10-a
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a+b=110-100
Subtract 100 from both sides.
a+b=10
Subtract 100 from 110 to get 10.
a=10-b
Subtract b from both sides.
100+b=110-a
Subtract a from both sides.
b=110-a-100
Subtract 100 from both sides.
b=10-a
Subtract 100 from 110 to get 10.
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