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