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x+2=21-y
Subtract y from both sides.
x=21-y-2
Subtract 2 from both sides.
x=19-y
Subtract 2 from 21 to get 19.
y+2=21-x
Subtract x from both sides.
y=21-x-2
Subtract 2 from both sides.
y=19-x
Subtract 2 from 21 to get 19.