Solve for x
x=\frac{3-y}{7}
Solve for y
y=3-7x
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7x=3-y
Subtract y from both sides.
\frac{7x}{7}=\frac{3-y}{7}
Divide both sides by 7.
x=\frac{3-y}{7}
Dividing by 7 undoes the multiplication by 7.
y=3-7x
Subtract 7x from both sides.
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