Solve for x
x=20-y
Solve for y
y=20-x
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x+y=\frac{40}{2}
Divide both sides by 2.
x+y=20
Divide 40 by 2 to get 20.
x=20-y
Subtract y from both sides.
x+y=\frac{40}{2}
Divide both sides by 2.
x+y=20
Divide 40 by 2 to get 20.
y=20-x
Subtract x from both sides.
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