Solve for x
x=\frac{y-b_{12}}{2}
Solve for b_12
b_{12}=y-2x
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2x=y-b_{12}
Subtract b_{12} from both sides.
\frac{2x}{2}=\frac{y-b_{12}}{2}
Divide both sides by 2.
x=\frac{y-b_{12}}{2}
Dividing by 2 undoes the multiplication by 2.
b_{12}=y-2x
Subtract 2x from both sides.
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