Solve for x
x=\frac{87-y}{2}
Solve for y
y=87-2x
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2x=87-y
Subtract y from both sides.
\frac{2x}{2}=\frac{87-y}{2}
Divide both sides by 2.
x=\frac{87-y}{2}
Dividing by 2 undoes the multiplication by 2.
y=87-2x
Subtract 2x from both sides.
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