Solve for x
x=\frac{7-y}{8}
Solve for y
y=7-8x
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8x=7-y
Subtract y from both sides.
\frac{8x}{8}=\frac{7-y}{8}
Divide both sides by 8.
x=\frac{7-y}{8}
Dividing by 8 undoes the multiplication by 8.
y=7-8x
Subtract 8x from both sides.
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