Solve for y
y=\frac{7-z}{2}
Solve for z
z=7-2y
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2y=7-z
Subtract z from both sides.
\frac{2y}{2}=\frac{7-z}{2}
Divide both sides by 2.
y=\frac{7-z}{2}
Dividing by 2 undoes the multiplication by 2.
z=7-2y
Subtract 2y from both sides.
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