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