Solve for y
y=\frac{8-x}{9}
Solve for x
x=8-9y
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9y=8-x
Subtract x from both sides.
\frac{9y}{9}=\frac{8-x}{9}
Divide both sides by 9.
y=\frac{8-x}{9}
Dividing by 9 undoes the multiplication by 9.
x=8-9y
Subtract 9y from both sides.
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